However his ex-wife tells Daily Mail Online Averys are trying to 'pin' murder on him and adds: 'He's kind of crazy, but not like that.'

Martinez previoulsy used Averys to take away his car after it was rear-ended and written off and had visited yard repeatedly

Earl Avery tells Daily Mail Online Martinez was on the yard on day searchers found Halbach's SUV there - and attacked ex the same day

Attack by Cuban-born Martinez was just 15 miles from Avery family salvage yard where Halbach was last seen

The mother of Brendan Dassey, one of the two convicted murderers in Making a Murder, tells of extraordinary prison meeting

Lawyers for one of the two convicted men in Making a Murderer have been told of an extraordinary claim by another prisoner that he has proof of their innocence.

The violent offender, a regular customer of the salvage yard run by the family of the two men, sought out one of their mothers during a prison visit to tell her that her son, Brendan Dassey, and her brother Steven Avery, were wrongfully convicted of the killing.

Andres Fuentes Martinez, 52, is serving 30 years in Green Bay Correctional Institution after he severely wounded Charlene Edwards with an ax at their shared home in Manitowoc, Wisconsin, on November 5, 2005, while screaming 'die dirty b****' as he hacked at her.

His claim of the men's innocence is the latest twist in the case highlighted by Netflix's Making a Murderer, which has enthralled millions around the world.

Daily Mail Online can reveal it for the first time - and a series of links between Martinez and the Avery auto salvage yard where Teresa Halbach was last seen and where her SUV and charred remains were found.

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New development: Andres Martinez sought out Brendan Dassey's mother to tell her he knew her son and Steven Avery - her brother - were innocent of the murder of Teresa Halbach. Martinez is a violent convict

Revelation: Brendan Dassey's mother Barbara Tadych (pictured with one of her grandchildren) tells Daily Mail Online how Martinez sought her out to tell her about her son's and

Convicted: Brendan Dassey was 17 (left) when he was found guilty of the murder of Teresa Halbach, shortly after the conviction of his uncle, Steven Avery (right) for the same crime

New clue? How Andres Martinez's attempt to kills his ex and the discovery of Teresa Halbach's car happened on the same day just a few miles apart. Earl Avery tells Daily Mail Online Martinez was on the Avery yard when the RAV4 was found

According to the Avery family, Martinez had visited their auto salvage yard, 15 miles from his home, earlier that day. On the morning of November 5, Halbach's car was found at the car yard.

Martinez bought parts at the salvage yard three or four times a month, according to the Averys, in the year before Halbach, a 25-year-old photographer, visited the property.

Her last known whereabouts were at the lot, on the outskirts of Two Rivers, after she had gone to photograph a minivan for Auto Trader magazine on October 31, 2005.

Her murder is detailed in the documentary series, Making a Murderer, which has captivated viewers around the world since it began streaming on Netflix on December 18.

Victim: Teresa Halbach's murder led to the arrest and conviction of Steven Avery and his nephew Brendan Dassey

One of the three Avery brothers, Steven, was arrested for Halbach's murder on November 9, 2005, after her car was found on the edge of the 40-acre property.

Halbach's charred bones and remnants of her cell phone were found in a fire pit near Steven Avery's trailer.

He was charged on November 15 with first-degree murderer, mutilation of a corpse and possession of firearms by a felon.

Special prosecutor Ken Kratz said that Avery's blood had been found in Halbach's car and that he was the last person to see her alive.

Shortly before he was arrested for Halbach's murder, Avery had filed a $36 million federal lawsuit against the county, its former sheriff and district attorney for wrongful conviction.

Steven Avery had been released in 2003 after spending 18 years in jail for a 1985 rape he didn't commit before being freed on DNA evidence.

Four months later after Avery's arrest, his nephew Brendan Dassey, then 16, told police he had helped rape, stab, shoot and dismember Halbach on his uncle's orders.

The teen has an IQ score of 70, which qualifies him as intellectually disabled. He later said his confession was coerced.

In March 2007, Avery was found guilty and sentenced to life in prison without the possibility of parole.

A month later, his 16-year-old nephew was found guilty of Halbach's murder and sexual assault, and sentenced to life in prison with the possibility of early release in 2048.

They, and members of the Avery family, have long maintained their innocence.

Sandra Greenman, Steven Avery's former fiancée, told Daily Mail Online that authorities had 'tunnel vision' in the murder case and did not look at other suspects.

The 73-year-old, along with Dassey's mother, Barbara Tadych, and Steven Avery's mother, Dolores Avery, revealed their suspicions for the first time about the 'ax man' as an individual who had escaped police attention.

Crime scene: The Avery scrap yard was searched for days by police after the discovery on it of Teresa Halbach's car. But Earl Avery says Andres Martinez was there when her SUV was found by searchers

Discovery: Teresa Halbach's RAV4 as it was discovered on the Avery property. Earl Avery says that Andres Martinez was on the property at the time of the discovery. Just under three hours later, he tried to kill his ex

Vast: The Avery yard, which was under snow this week, contains hundreds of wrecked cars which are stripped for parts before being crushed.

Burn pit: This was the place where Brendan Dassey originally told police he had seen body parts being burned behind Steven Avery's trailer. Bones were found there.

On July 21, 2005, Andres Martinez called the auto salvage business to have them retrieve his 1997 Volkswagen Jetta after he was rear-ended on the highway and the car was left a complete write-off, Charles Avery said.

The Averys collected the car from an off-ramp of I-43 and brought it to the yard where it was stripped for parts. The wrecked car still sits on the property.

A vehicle history report tied to the car's Vehicle Identification Number, or VIN, revealed that on July 21, 2005, the Volkswagen was involved in a collision with another vehicle in Wisconsin.

The Averys' business log book from 2005 reveals that on July 22, the car was listed at the yard.

The owner's details were written down as Rene Camacho, with an address on the 1900 block of Franklin Street, Manitowoc.

Andres Martinez lived at that address but it is not clear why the name Rene Camacho is listed as Charles Avery told Daily Mail Online that Martinez completed the transaction.

Camacho later became the son-in-law of Martinez's ex-girlfriend, Charlene Edwards. Camacho did not respond to messages from Daily Mail Online.

Charles Avery told Daily Mail Online that Martinez came three or four times a month to the business for car parts.

It is not clear whether Martinez was on the Avery property on the day Halbach went missing.

DAY BY DAY, HOW HALBACH, AVERY AND MARTINEZ OVERLAPPED October 31 Photographer Teresa Halbach goes to see three clients for Auto Trader magazine - the Avery auto salvage yard, where she was to picture a minivan, was her last stop. Steven Avery is the last know person to see her alive November 3 Halbach family report Teresa missing November 5 9.50am: Volunteer search teams are given permission by Earl Avery to search the 40-acre car lot and begin just before 10am. Earl Avery told Daily Mail Online that Andres Martinez was at the yard at the time 10.20am: Volunteer Pamela Sturm finds Halbach's Toyota RAV4 on the edge of the Avery land 1:30pm: Andres Martinez attacks his ex-girlfriend, Charlene Edwards, with an ax after lying in wait for her at her Manitowoc home. She is hospitalized with severe head wounds and he goes on the run November 6 Sheriffs' deputies from Manitowoc and Calumet counties search the Avery property. Warrant issued for Martinez November 7 Wisconsin state crime lab finds 'significant evidence' in Halbach's car. Martinez arrested after surrendering to police at a trailer south of Manitowoc. He is charged with attempted murder November 9 Steven Avery arrested for being felon in possession of a firearm November 10 Halbach's car key found in Avery's trailer bedroom. Charred bones and cellphone pieces found in burn pit close to his trailer November 15 Steven Avery charged with Halbach's murder Advertisement

But Earl Avery told Daily Mail Online that Martinez was at the yard on November 5.

That was she same day Earl gave permission to volunteers and law enforcement to search for signs of Halbach.

Her Toyota RAV4 was found on the edge of the 40-acre property that morning.

According to court documents, at 1:30pm that afternoon, Martinez, then 42, attacked his ex-girlfriend, Charlene Edwards, at her home on the 1900 block of Franklin Street in downtown Manitowoc.

She was struck twice with an ax and suffered serious head injuries, according to sentencing documents seen by Daily Mail Online.

Martinez also swung the hatchet at a child in the home, missing by only a few inches. He also struck a dog with the hatchet, according to the court papers.

According to a criminal complaint from November 15, 2005, Martinez attacked his girlfriend in front of her son, 16, and 17-year-old daughter, who were thrown across the room by him as they tried to protect their mother.

Edwards' son told police that Martinez had let himself into the house with a key to write a note for his mom who was on her way home from work with her daughter.

The complaint reads: 'Charlene walked into the kitchen and she saw Andres and told Andres she didn't want to see him anymore. JJE [Edwards' son] said Charlene told Andres she was seeing someone else and Andres called Charlene a 'dirty f****** b****.'

The complaint said the pair began arguing about a Chevrolet Cavalier which Martinez claimed to have bought but was registered under Edwards' name.

'JJE said Andres became very upset with Charlene and began yelling at her that 'you can die you f****** b****', saying the next time he came over he would smash out all the windows on the house, said he'd burn down the house with the kids in it and told her, 'I hope you burn in hell.'

According to the victim's son, Martinez then grabbed his mother and threw her to the floor on her stomach while she called out to her children for help. The children attempted to intervene but Martinez knocked them to the floor.

'The complainant further alleges that JJE said Andres went into a pantry that was off the kitchen by the stove, and when he came back into the kitchen, he had a hatchet in his hand...

'JJE said Andres grabbed Charlene's left leg, while she was still lying on her stomach, and said 'die dirty b****' as he (Andres) brought the hatchet up in his right hand about to his head height, and struck Charlene with the hatchet in the back of her head/back of her neck.'

With the help of her children, Edwards managed to flee to a tattoo parlor across the street who called 911. The victim was hospitalized with a large wound in the back of her head, close to her neck.

She also suffered a laceration to her arm from trying to protect her head from the ax. According to the complaint, when asked by an officer why the attack had happened, Edwards said: 'To kill me.'

Lying in wait: Andres Martinez was waiting for his ex-girlfriend Charlene Ross at her home. Court records show that Charlene told Andres she was seeing someone else and Andres called Charlene a 'dirty f****** b****' then tried to kill her with an ax

Victim: Charlene Edwards was hit in the back of the head, the neck and the arm by Martinez. With the help of her children, she managed to flee to a tattoo parlor across the street and someone there called 911. She died of cancer in October 2014

Rap sheet: The initial charges against Martinez. He was convicted of the first count and the other charges dismissed. He had a long record of dealing with police, it was said, including previous domestic violence arrests

Martinez, who was charged with a domestic assault on Edwards a month earlier, 'told her he would kill her if she left him'.

Following the attack, Martinez dropped the ax and fled the property. He surrendered to police two days later after he was found hiding at a friend's trailer, south of Manitowoc.

Following his arrest, Martinez told a Manitowoc police officer 'that every time somebody talked negative to him 'It just fills me up into anger.'

At the time of the ax attack, Martinez, a Cuban national who had moved to the US, was out on bail for a domestic violence assault on Edwards.

According to reports, on October 2, Edwards drove to a bar where Martinez pulled her from the car by her hair and slapped her.

Martinez was charged with the battery of Charlene Edwards and ordered to have no contact with her and stay away from her home.

Martinez was also on parole from prison at the time after serving 16 years for a string of burglaries in the Manitowoc area.

Prior to that in 1983, he was found guilty of operating a vehicle without the owners' consent. He also spent time in jail for petty theft, forgery, and damage to a vehicle.

At his sentencing for the ax attack, the prosecution said Martinez had spent much of his life in prison and added: 'He is a violent man. Whatever he wants, he will stop at nothing to get it.'

Martinez's defense was that the attack took place while he was suffering from a 'blackout' but a doctor could not support the claim.

His defense lawyer, Robert Dewane, told the court that Martinez abused controlled substances during his relationship with Edwards, and claimed they used drugs together.

Martinez was found guilty of attempted first-degree intentional homicide in September 2006.

Remains: This is the 1997 Volkswagen Jetta rear-ended on I-43. Martinez owned it and asked for it to be taken away by the Averys, Charles Avery tells Daily Mail Online. It was not his only visit to the yard - he was there three or four times before he attacked his ex-girlfriend

Linked: The Avery yard's records show the written-off car as being registered to Rene Camacho. The address recorded is that of Martinez's ex-wife. Camacho later became her son-in-law. He did not respond to messages from Daily Mail Online

Traced: The vehicle identification sticker of the 1997 Volkswagen Jetta which the Averys say belonged to Andres Martinez, was rear-ended, and is still in the Avery auto salvage yard

Charges of second-degree recklessly endangering safety, physical abuse of a child, mistreating an animal and bail jumping were dismissed by the prosecutor.

Martinez was sentenced to 30 years in prison and becomes eligible for release in 2035.

He is currently serving his time at Green Bay - alongside Brendan Dassey.

Dassey's mother, Barbara Tadych, told Daily Mail Online this week that Martinez approached her when she was visiting her son at the prison three or four years ago.

According to Tadych, Martinez was the inmate assigned to take photos of other prisoners and their families during visiting hours.

She said that Martinez recognized her. 'He spoke real soft so the guards didn't hear him. He said, 'I know Brendan and Steve didn't do this. Brendan doesn't belong here,' Tadych told Daily Mail Online.

Tadych said that her son did not associate with Martinez or any other prisoner and never talked about his case. She said that he spent most of his time playing card games like cribbage.

'Brendan's doing pretty good,' she said. 'But he always says he wants to come home.'

Tadych said she had informed one of her son's defense lawyers, Laura Nirider, about her interaction with Martinez. It is unclear whether Avery's legal team was aware of the information.

Martinez's ex-wife, Verian Martinez, told Daily Mail Online that he had nothing to do with the Teresa Halbach murder and that the Avery family had tried before to pin it on him.

Juxtaposition: Martinez's attack on his ex-wife was highlighted in the local newspaper just below the revelation that Halbach's Toyota RAV4 had been found on the Avery property

Overlap: Martinez's arrest was on the same day as what tests said was Steven Avery's blood was found in Halbach's car. It was not disclosed what the 'significant' evidence was at the time

She said: 'I know what they're trying to do because I heard this before. They're trying to say my ex-husband was out there. No, he was not out there.

'I know they are some crazy people, I don't care what anyone says. My ex-husband is not like that, you know he's kind of crazy, but not like that.'

She claimed that investigators had already looked at her ex-husband as a potential suspect.

She said: 'A long time ago, the FBI had me and my son come to Burger King to talk about that. I told them that he [Martinez] did not have anything to do with that. '

Verian Martinez told Daily Mail Online that she was always with her ex-husband when he went to the Averys' salvage yard.

She added: 'We would go out there to get parts for cars. He was never out there by himself.

'Those people know that they did that to that girl and they are trying to blame someone else. They know they did that s***.

'They are not going to pin this on him. He wasn't out there by himself.'

His ex-wife said that Martinez's ax attack on his former girlfriend was also a 'misunderstanding'.

Verian married Andres Martinez in August 1984 and the couple divorced in 1997.

He was previously married in Cuba but got a divorce before coming to the US.

He and his former wife have two sons, James, 34, and Aladino, 31. She retained sole custody of their sons, according to family court records.

Charlene Edwards Ross, died of cancer aged 45 on October 9, 2014. She is survived by her husband, two sons and two daughters.

Police told Daily Mail Online this week that they had not established a link between Martinez and the Averys.

Deputy Chief Tony Dick told the local Herald Times Reporter newspaper in 2005 that the suspect had 'a long history with the police department'.

When asked about the case by Daily Mail Online this week, Dick, who has since retired from the department, said he had no knowledge of Martinez's connections to the Averys.

The police report on the ax attack was not immediately available from the Manitowoc Police Department.

Manitowoc Sheriff's Department told Daily Mail Online that questions regarding the Avery case should be referred to Calumet County Sheriff as lead investigators.