Elizabeth Ennen: Missing 15-Year-Old West Texas Girl Found Dead, Boyfriend's Father Suspected

LUBBOCK, Texas (CBS/AP) Police have confirmed that Elizabeth Ennen, a missing 15-year-old West Texas girl whose body was found beside a remote road, was strangled to death.

The Lubbock County medical examiner positively identified the body Tuesday as that of Ennen, a student at Lubbock Monterey High School who had been listed for weeks as a runaway.

The father of Ennen's boyfriend, 45-year-old Humberto Salinas Jr., is already charged with aggravated kidnapping in the case, and police plan to add a murder charge.

Elizabeth was last seen at a Lubbock motel where she was baby-sitting Salinas' children the evening of Jan. 4 while Salinas went to play bingo and his wife went out with her sister, according to court documents.

Court documents detail motel surveillance video footage that police say shows Salinas chasing Elizabeth in a hallway, then grabbing her by the arm and forcing her toward a parking lot where his vehicle was parked. Footage then shows the vehicle leaving the motel, returning later, then leaving again.

Salinas has told investigators Elizabeth was "like a daughter" to him, according to the court records. He told investigators he took the teen home from the motel when "she started to act strange" and that he returned to her home after seeing that she'd left her purse in his car.

When he returned the purse to her house, Elizabeth's mother became suspicious and questioned Salinas, telling him her daughter was with him, the records state. Her mother reported her missing at 1 a.m. Jan. 5, three weeks ago.