Kayleah Wilson's Boyfriend Arrested, but Not for Murder

May 22, 2010 — -- Police have arrested the 18-year-old boyfriend of Kayleah Wilson, the 12-year-old whose decomposed body was found Wednesday in Greeley, Colorado, but he is not being charged with murdering the girl who had disappeared nearly two months ago.

Instead, Robert Laurencio Montoya was charged with sexual assault on a child one count of sexual assault on a child as a pattern of abuse, Greeley, Colorado, police said Friday. Montoya was arrested Wednesday, but it was not announced for two days.

"This arrest culminated an investigation that developed from information that probable cause existed to believe the suspect was involved in a sexual relationship with Kayleah Wilson," Greeley police spokesman Sgt. Joe Tymkowych said. "This arrest is separate and distinct from the Kayleah Wilson homicide case that is currently being investigated."

Montoya was being held on $100,000 bond on the two felony charges.

According to ABC News Denver affiliate KMGH-TV, Tymkowych said he could not confirm rumors that Kayleah might have been pregnant. He said police believe the relationship with Kayleah started last fall, when Montoya was 17. The teen turned 18 on Jan. 18.

All court records on the case have been sealed by the Weld District Attorney's Office.

The body, found Wednesday just one mile from where Kayleah went missing nearly two months ago, was identified through dental records, said Greeley Police Chief Jerry Garner at a press conference Thursday.