Convicted murder Steven Avery has publicly criticized his two former lawyers for the first time - claiming 'they didn't do their job' or else he wouldn't be in prison.

In a handwritten letter sent to In Touch Weekly, the Making a Murderer subject claims there is evidence to exonerate him and that his ex-lawyers, Dean Strang and Jerome Buting, failed to represent him fairly.

Avery was convicted of murdering 25-year-old photographer Teresa Halbach with his nephew Brendan Dassey. Avery was sentenced to life in prison without parole in 2007.

He has since hired a new attorney, Kathleen Zellner, who he believes will help free him during the appeal process for his conviction.

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Innocent? Convicted murder Steven Avery is hitting out against his two former lawyers, Dean Strang (right) and Jerome Buting (pictured left with Avery) claiming they didn't do their job properly

Avery (left) was convicted of murdering 25-year-old photographer Teresa Halbach (right) with his nephew Brendan Dassey. Avery was sentenced to life in prison without parole in 2007

In his letter (above), Avery lists out 15 reasons why Strang and Buting didn't do their job and why he should be freed from prison. He claims they wouldn't keep him informed about what was happening in the case

The 54-year-old blames his former lawyers for the guilty verdict he received in the case because he claims they didn't investigate the evidence fully.

This is the first time the Wisconsin native has publicly slammed the two attorneys who have gained fame from their portrayal in the Netflix hit show.

In his letter, Avery lists out 15 reasons why Strang and Buting didn't do their job and why he should be freed from prison.

He first says they didn't provide experts to analyze the blood splatter in his garage, where he allegedly shot 25-year-old Halbach, and that they botched the processing of her bones.

When the results of a court ordered FBI test came back during the trial showing no trace of a chemical added to blood to inhibit clotting in a sample of his blood found in the victim's car, it destroyed the lawyers argument that it was planted.

Strang later said: 'We had no chance at that point to do independent testing, or even to react terribly well to it.'

Avery has hired a new attorney, Kathleen Zellner (above), who he believes will better represent him during the appeal process for his conviction.

In the letter (above), Avery wrote: 'Lawyers sould (sic) be responsible for they (sic) wrong dong!!!'

Avery believes the pair of attorneys should have had the blood tested earlier, as cops had a vial of his blood in custody prior to the trial.

In Avery's letter, he also alludes to the theory that six burn barrels were found on his family's property, instead of five as stated in the reports.

'They missed that there was a 6th burn barrel,' he wrote.

It's been speculated that the fifth and sixth barrels were counted as one by authorities investigating.

However, Avery alludes that if it's true, his former lawyers missed an opportunity to point out not proper investigating by police in the case. And that could have called the barrels into question that were presented in the case by prosecutors.

In addition, Avery argues that Buting and Strang did not investigate Joshua Radandt, the co-owner of the Radandt quarry next to his salvage yard where a piece of human pelvic bone was reportedly found.

Furthermore, cracks could have been created in the prosecutors case, if his defense lawyers had questioned Radandt who told authorities that he witnessed a fire on Avery's property the day of the murder.

Avery wrote that Strang 'blames the system but doesn't accept responsibility for his mistakes.'

Avery (above) wrote: 'Dean and Jerome are Bad Attorneys they dont (sic) now (sic) what justice is and they dont (sic) now (sic) what is a (sic) investigation is because if they did they would have done it for a (sic) innocent man like me!!!'

He also claims that Strang and Buting wouldn't keep him informed about what was happening in the case.

'Dean and Jerry didn't do no investigation on this case, if they did I would not be in prison,' Avery wrote.

'They would have the suspect if they did there (sic) job!!

'Dean and Jerry all they were doing is predict the state and there (sic) lawfirm (sic),

'Lawyers sould (sic) be responsible for they (sic) wrong doing!!!'

In closing the letter, Avery said that Strang and Buting should lose their licenses to practice law.

'Lawyers sould (sic) loose (sic) there (sic) license when they dont (sic) investigate they (sic) case to proof (sic) there (sic) clients and they violating the ethics, the state sould (sic) take there (sic) license for good,' Avery wrote.

He added: 'Dean and Jerome are Bad Attorneys they dont (sic) now (sic) what justice is and they dont (sic) now (sic) what is a (sic) investigation is because if they did they would have done it for a (sic) innocent man like me!!!

'And I was on appeal and they were still talking about the case and that was there (sic) ethics was (sic) violating my appeal!!

CLAIMS MADE BY STEVEN AVERY OVER HIS EX-DEFENSE LAWYERS In a handwritten letter convicted murder Steven Avery sent to In Touch Weekly, he blames his former lawyers Dean Strang and Jerome Butting for his guilty verdict. Avery said the two men 'didn't do no investigation on this case, if they did I would not be in prison.' Below is the list of all the claims Avery made against his ex-lawyers: Lack of experts on: blood spatter (sic), EDTA, Bones

Didn't re-enact the key falling out of the book Case

Only wanted to blame my family ... They didn't look at other suspects

They didn't follow up on the dog tracks

They missed that there was a 6th burn barrel

They didn't investigate Radandts' (sic) alibi

Dean blames the system but doesn't accept responsibility for his mistakes

They ignored the evidenc (sic) in the quarry,

Dean and Jerry wouldn't tell me what was going on in my case at all,

Dean and Jerry didnt' do no investigation on this if they did I would not be in prison, (sic) They would have the suspect if they did there (sic) Job !!

Dean and Jerry all they were doing is predict the state and there (sic) lawfirm (sic)

Lawyers sould (sic) be responsible for they (sic) wrong doing!!!

Lawyers sould (sic) loose (sic) there (sic) license when they dont (sic) investigate they (sic) case to proof (sic) there (sic) clients and they violating the ethics, the state sould (sic) take there (sic) license for good.

Dean and Jerry didn't do nothing when the state investigators threaten some of my people to say what they won't (sic) to say or if they dint (sic) they would put them in jail or take any thing (sic) from them!

Dean and Jerome are Bad Attorneys they dont (sic) now (sic) what justice is and they dont (sic) now (sic) what is a (sic) investigation is because if they did they would have done it for a (sic) innocent man like me!!! And I was on appeal and they were still talking about the case and that was there (sic) ethics was (sic) violating my appeal!! Advertisement