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The 18-year-old man accused of sexually assaulting Kayleah Wilson admitted he frequently had sex with the 12-year-old while he was living with her family in their Greeley apartment, according to an arrest affidavit unsealed Wednesday.

After Kayleah’s mother, April Wilson, twice ordered Robert Laurencio Montoya to stay away from her daughter, police found him peeking in windows at Brentwood Middle School, where she was a sixth-grader, the affidavit said.

Police said that during interviews conducted in the days after Kayleah disappeared March 28, Montoya told them that after one attempt to contact her at school, Kayleah called him a “stalker freak” and told him to leave her alone.

Montoya was arrested May 19, hours after the girl’s badly decomposed body was found in an irrigation ditch.

He was charged with two counts of sexual assault of a child after police investigating Kayleah’s disappearance learned there had been sexual contact between her and Montoya.

The police affidavit unsealed by court officials details the sexual-assault case against Montoya, who is in Weld County Jail on $100,000 bail.

Police and search crews combed the area around her apartment for more than two months until her body was recovered last week. The Weld County coroner ruled her death a homicide.

Montoya is considered a “person of interest” in Kayleah’s death, but he has not been charged.

April Wilson told police that Montoya moved into her home in October.

Montoya’s mother — Roxanne Montoya — asked him and his sister to leave their home because she wanted to meet in her home with a man identified as Jonas Garcia, police said. He couldn’t be around children because he is a registered sex offender, the affidavit said. Reached at her home Wednesday, Roxanne Montoya declined to comment.

Although she told investigators she had earlier discovered Montoya and Kayleah alone in a bedroom, April Wilson said she didn’t see signs of sexual contact between them until she confronted them in January, and he confessed.

Wilson kicked Montoya out. But she saw her daughter and Montoya together again in February at an abandoned auto dealership. She again told Montoya to stay away from her daughter, police said.

Montoya told police he was involved sexually with Kayleah until the middle of February. He also told police Kayleah would try to get him to “physically abuse her during their sexual encounters.”

Police said Kayleah’s friends indicated she had commented about possibly being pregnant.

Montoya admitted he tried to see Kayleah again after her mother ordered him not to do so. He told police he would hide in bushes outside her apartment and tried to talk to her at her school.

Police went to the school Feb. 19 and “made contact” with Montoya, who was looking in the windows, the affidavit said.

Montoya also admitted to police that he knew Kayleah was 12 when he had sex with her, the affidavit said.

Monte Whaley: 720-929-0907 or mwhaley@denverpost.com