Making A Murderer's Steven Avery has turned into the world's strangest sex symbol and is now being besieged by female fans wanting to be his next wife.

The 53-year-old convict gets up to 40 letters and pictures of near-naked girls a day, but fame has gone to his head after the success of the Netflix TV series, according to his on-again-off-again fiancée, 73-year-old Sandra Greenman.

He now thinks he's a Hollywood star, Greenman says, and is already spending the millions he thinks he'll get in compensation once he's released.

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Avery's on-again-off-again fiancée, 73-year-old Sandra Greenman (left, with Avery) says he's completely transformed since the show first was available on Netflix in December

Making a Murderer's Steven Avery has turned into somewhat of a sex symbol in prison, receiving up to 40 letters and pictures of near-naked girls a day

Greenman is the only person to stand by Avery's side since he was convicted of Teresa Halbach's murder in 2005.

She says that he has completely transformed since the show first streamed on Netflix in December, and he's now trying to seduce a string of women while behind bars - and is keeping her as a 'first reserve'.

Avery is growing particularly close to one 53-year-old brunette from Las Vegas, who is visiting him in two weeks.

Avery was sentenced to life without parole for killing 25-year-old photographer Teresa Halbach in 2005 alongside his nephew Brendan Dassey, then 16, who is set to be released within the next 90 days after having his conviction quashed two weeks ago.

There was this one woman in Illinois who came to see him, then put on her Facebook page they were a couple, and said he was going to marry him. - Sandra Greenman

Avery's own chances of being released have increased since Chicago lawyer Kathleen Zellner took up his case and said that DNA testing will prove Avery isn't the killer.

But his behavior is alarming those closest to him, including Zellner, and Avery's parents Allan and Dolores, who live at the family's auto salvage yard in Mishicot, Wisconsin.

Greenman, who visits Avery at least once a week, says: 'There's been a lot of issues I've been speaking to the lawyer about. He has received more mail from women, and I'm talking about not just letters, but pictures, bikini ones.

'For a while, he was getting 40 letters a day, some of these women are falling at his feet, they want to be a celebrity.

'He's never had women after him like this. He's the strangest sex symbol you'll know.

'There was this one woman in Illinois who came to see him, then put on her Facebook page they were a couple, and said he was going to marry him.

'There's this other woman, originally from California and now living in Las Vegas, who's going to see him.

'She's very pretty, there's no way she'd want Steven Avery usually. All the family are afraid of her, something isn't right, I know she wants fame, and she's looking for money.

Greenman, who visits Avery at least once a week, says several women have started visiting Avery in prison. Pictured above, a group protests Avery and Brendan Dassey's imprisonment

'Zellner did a background check, I assume nothing came up. She was concerned about blackmail, Steven likes to talk. I think she's a spy, she could tell the police [if he talks about the case].

'Zellner said, "Help me protect him", when she took the case, as he's not going to recognize the danger; he's going to have so many women throw themselves at him. But I said: "I can't protect him, he's going to love this, he's going to eat this up."

'He's very stubborn at the moment. [He said:] "I'm Steven Avery, I can do what I want. They'll send me money, pictures, they'll do anything I want them to do".

'He's starting to believe the hype. One woman sent him $900, and now is asking me for it back. She says he's writing to women promising them all sorts of things.

Avery was sentenced to life without parole for killing photographer Teresa Halbach in 2005 alongside his nephew Brendan Dassey

'He's now well liked in prison, I've seen it a couple of times, prisoners putting their hands on his shoulder saying good luck, or people coming up to us in the visiting room.

'I'm sure he'll be signing autographs soon. This is all going to his head, this new Steve thinks he can get away with anything.

'He told me that they don't search his cell as much as they used to. I asked why, and he said: "They wouldn't dare." What, because they'd be scared to annoy all his followers?

'He thinks he's a Hollywood star. I said it to him on Saturday: "What did you do with my Steven? Who are you?" The difference is he's arrogant, thinks he can do anything, he's not loving anymore.

'He thinks he's going to be released tomorrow. He says he can't do this any more, he wants to start living now. You ask him how is he going to start, and he comes out with all these crazy things.'

Greenman, who lives in Neenah, Wisconsin, first went to visit Avery in prison at the suggestion of her husband Wally - who was housebound and suffering from dementia and Parkinson's Disease - and became obsessed by the case.

After Wally passed away in 2009, she and Avery became partners and were due to marry, but Greenman admits that she couldn't go through with it at the end of last year, as she didn't want a wedding in prison.

Since then, they have talked about the past and their future, but it's still up in the air, as Steven wants to play the field and also keep Greenman.

Avery, pictured with Greenman, his cousin Carla Chase (right) and her daughter Danielle (left), now thinks he's a major Hollywood star

His behavior is so concerning that Making A Murderer filmmakers Laura Ricciardi and Moira Demos are considering not putting anything about his private life into the sequel, which is happening later this year.

A spokeswoman for Ricciardi told DailyMail.com that Ricciardi denied ever speaking with Greenman and denies discussing the second season of Making a Murderer with her.

Greenman says: 'Are we an item? Let me put it this way, we still love each other, we admit we do.

'He always says he doesn't want me out of his life, there's a bond that will never be broken, but someone else can have him, I've seen another side of Steven I don't like.

'He told me: "There's a pool of women." I said: "Where do I fit in the pool?" He said: "You're out of the pool, you're different from that, but I'll see what these women are like first."

'I told him: "Go fly a kite." I have been ridiculed, almost disowned by family, friends walked away from me because of Steven Avery.

'But I'm trying to protect him, I don't want him to be taken for a ride, he's naive when it comes to women. He's only been out in the free world for two years as an adult.

'He has only the mental capacity of a teenager with these issues. I'm not going to sit and let him go through these women.

'I told Laura [Making A Murderer filmmaker] - I spoke to her three times this week - I said: "I hate the documentary for what it's turned him into." She said: "Woo, I'm sorry."

'I said: "It's turned Steve into a jerk, he wasn't like that, it's turned him into a ladies man."

'She knows that. She did say to me: "He's really messing up." They said they're not going to put any of his personal life on the next series, as he's making it too messy, too many women.

But Avery's wild behavior is alarming those closest to him, including Greenman (pictured), his attorney and his parents, Allan and Dolores

'When they do a second series, the tide could turn [with his popularity], I can see it happening.

'He said he'd never date any other women until he gets out of prison - he said this to his lawyer Kathleen Zellner - now he's telling everyone he's their girlfriend.'

Ricciardi denies speaking with Greenman about how the documentary has changed Avery.

Greenman claims that Avery is already thinking about the huge multi-million compensation he'll be entitled to if he's found not guilty. But that could take up to two years.

'But I'm trying to protect him, I don't want him to be taken for a ride, he's naive when it comes to women. He's only been out in the free world for two years as an adult. He has only the mental capacity of a teenager with these issues. I'm not going to sit and let him go through these women. - Sandra Greenman

'I hope that it doesn't drag out, but it's so possible,' Greenman says. 'The DNA testing itself will take three months, then it's the petition to the courts, then it goes before the judge.

'His lawyer said within two years. But he's counting the days down now, he wants to get out now.'

She adds: 'I wouldn't want to live with him, he's like a little kid. He's going to need counseling. His mental age is 21, he thinks he's still that age. I think he's going to struggle as a free man.

'He's told me for several months, that he's dead inside,' Greenman says.

'I just don't have any feelings anymore,' she recalls Avery saying, adding that it scared her 'to death'.

When she asked what he meant, she says Avery said: 'I don't feel love for anybody, for anyone right now.'

'I don't know what he's capable of any more. He's going to need help,' Greenman says.

She adds: 'I hope he has his head screwed straight, but the way he's talking now, I think it's possible that he could lose everything. He sees the dollar signs, there's no question about that. He's already spending the money.

Greenman claims that Avery is already thinking about the huge multi-million compensation he'll be entitled to if he's found not guilty

'He wants to buy a big piece of land across the border in Michigan, he wants lots of acres. He wants me there, all three of us - him, his new wife and me in a house close by.

'He wants to get out and have some fun. He's already looking at the price of four wheelers. He wants a pontoon, he wants to take all his family, we've always talked about this.

'I think he's counting his money before he has it, I don't like that. It's going to be a while before he gets it, I hope these women understand it as well, they maybe in for a shock.

'One thing I give him credit for, he wants to make sure that no one else gets treated like him, how many people get wrongly accused twice? He wants to make a difference.'

Greenman says that very few people visited Avery in prison, including brothers Charles and Earl, until the show began.

At the time of his arrest, Avery was suing Manitowoc County for $36million over being wrongfully imprisoned for 18 years for sexually assaulting Penny Beersten.

Although Greenman gets on well with the family, she only has good words to say about his mother and father, and says that the rest are 'vultures'.

Now when she goes to Waupun Correctional Institute, she says the visitor area is full of women or family members.

Greenman says: 'Oh yes, very much so, lots of vultures in the family. This is what Steve does with his hands [she then rubs her thumb and forefinger], he says: "They all want this."

At the time of his arrest, Avery was suing Manitowoc County for $36million over being wrongfully imprisoned for 18 years for sexually assaulting Penny Beersten. Pictured above is Avery in an early mugshot

'His mom and dad stood by him, when he was at the other correctional facility Boscobel, which is a three-hour drive, and I was there all the time.

'Now they're coming in droves, they all go. It bothers me. Where have you been when he needed you most? Did anyone help me find a lawyer?

'I spent hours and hours to find lawyers. I called every state, where were the rest of them? Not his mom and dad, they couldn't do it.

'I'm not saying poor me, I did it because I believed his innocence, I loved him, but I could have had some support from his family. They want their fifteen minutes of fame. I was there when there were no cameras.'

I'm not saying poor me, I did it because I believed his innocence, I loved him, but I could have had some support from his family. They want their fifteen minutes of fame. I was there when there were no cameras. - Sandra Greenman

Greenman just wants justice to prevail for Avery, but is concerned that the Making A Murder bandwagon is getting out of control, and is especially damaging for parents Dolores and Allan, who are both 79 years old.

The family compound has become a weird tourist attraction and people just stand and stare at Avery's mother through the windows.

She says: 'I think it's going to get more Hollywood. I don't think it's going to stop, there's going to be a third, fourth installment, Netflix have a good thing going.

'The more it goes on, the bigger Steven's head is going to get. He's going to think he's infallible, he thinks he's untouchable already. I can do what I want, I'm Steven Avery.

'I think his mom's just about had enough. She's not a well person. In the morning, she likes to stay in her PJs, but she can't, as someone might be at her door, not just reporters.

'In the evening, there will be someone at the door. Everyone wants a piece of her, they think the Avery house has now turned into a public museum, they can just peer in and see it all.

Avery's nephew, Brandan Dassey is set to be released in the next 90 days after having his conviction quashed two weeks ago

'His parents are not young, they deserve some quiet time. His mom has problems with her memory, she's told me she can't relax, she's stressed.

'His dad is very deaf, you can't speak to him. Most of the people are well-wishers, they take pictures of themselves at the sign, but come on now, leave them alone.

'I don't think his parents want a second series. It's a circus, we don't need a second series, it's going to get worse. People see it as a soap opera. So many people want a happy ending, but it's not going to turn out like people want it.'

No one is as close to Avery as Greenman, and that doesn't ever look likely to change in the immediate future, as the pair seem to be inseparable.

She just hopes that her son's words about Avery never come back to haunt her.

Greenman says: 'There's been a lot of crying, I'm still going at least once a week, I don't want to walk away, the case is part of me, and he still wants us to have some sort of relationship.

'Steven Avery is an obsession, an addiction. Without him, it's like cutting off my right arm. That's why I can't stay away.

'It's ok when I go with the family, we can talk about all sorts of things. It's when it's just me, and we talk about our future, and our past, that's what I cry for, what we've lost.

'It's consumed me, it's going on for 11 years. My son has never said one thing wrong about Steven to me, but the other night he called me, and I was crying, I said I don't care if I died, I was a basket case. And he said: "I always said that Steven Avery would kill you one way or the other." That really hurt me, I was so upset.

She recalls telling her son, 'Please don't say that about him', to which he responded: 'I'm tired of seeing you hurt, why don't you stay away?'