Madeline Soto's mother “accepted” the victimization of the teenager by murder suspect Stephan Sterns, the investigator claims

ORANGE COUNTY, Florida. – Stephan Sterns is accused of sexually abusing and killing 13-year-old Madeline Soto. New documents obtained by FOX 35 this week show the teen's mother may have known about the alleged abuse.

In a fiery conclusion to an incident report from the Orange County Sheriff's Office, a detective writes that Jennifer Soto continually protected Sterns.

Sterns was charged with the teenager's murder in April. He also faces dozens of sexual abuse charges, including assault, sexual battery and child pornography. No one else has been charged in the Madeline case and no further charges are pending, a Kissimmee police spokesperson confirmed to FOX 35 on Thursday.

For example, when asked by a detective why she chose Sterns over her daughter, she at one point referred to “the sex stuff” as “not evil,” according to new documents and evidence obtained by the sheriff's office as the search for the missing teenager began.

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“It seemed to me that she had already accepted the victim role and her feelings seemed fabricated,” the investigator wrote in the report.

Detectives also questioned Jennifer about Madeline and Stern's relationship.

“It doesn't sound like you were ever worried about Stephan. You know him really well. You've never found fault with him. [Madeline] and him together, right?” said the detective.

Jennifer said that at first she didn't trust Sterns with her daughter – because she wouldn't trust any man. But over the years she changed her mind.

“I paid close attention to how he treated her during the first few years and always asked if there was anything strange, but nothing was really strange,” she said.

Jennifer also told investigators that Madeline and Sterns often slept together in her bed and sometimes alone and unsupervised in a separate bedroom. She said the night before she reported Madeline missing, she wanted a good night's sleep and slept in her bedroom, but asked Sterns and Madeline to sleep together in the guest room.

And this despite the fact that there was enough space in the house for all three people to sleep in separate rooms, investigators note.

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Recorded interviews with Stern's father show that he questions the trustworthiness of his own son.

“There's something going on. He's been lying to us his entire life and it's just never gotten better,” Stern's father, a former OCSO deputy, told investigators in an interview.

“Before I left the house the other day, I turned to my wife and asked, 'Do we really know Stephan? Can we honestly say we really know him?'” Stern's father said.

But Jennifer trusted Sterns enough to let him sleep in the same bed as her daughter.

“Of course it would unsettle anyone if a little girl slept with a man who was not her father. It sounds strange!” she said in a recorded interview with detectives. “I trusted him enough to let it happen.”

Records reviewed by FOX 35's Marie Edinger also show that Madeline's teachers and classmates knew something was wrong. They just didn't know what.

Body camera video taken by detectives combing the neighborhood where the Soto family lived shows an interview with a young girl who says she knew Madeline.

“She said she ran away when she was 13, but I don't know why,” the little girl told officers.

Incident reports indicate that friends told investigators that Madeline “seemed quite sad” and had “a nervous breakdown” a few days before her death.

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“Occasionally she would start crying? Do you think that happens once a month?” a detective asked one of Madeline's friends.

“Sometimes it just happened,” said the little girl.

However, Madeline’s colleagues were not the only ones who knew something was seriously wrong.

Police reports show that a counselor told investigators that Madeline had “sleepy days” when she would come home, hang her head and do nothing – and he suspected she might be depressed.

Another counselor noted that Madeline had previously spoken about Sterns, saying he was “weird” and “made her uncomfortable” – and said her grades improved after December, when Sterns left the home.

A hearing is scheduled for October 14 for Sterns. So far, he has refused to appear in court.