HOUSTON -

Members of the Houston Police Department Dive Team recovered the body of a missing teen at the center of an Amber Alert in the Sims Bayou Wednesday night.

Vy Ngoc Bao-Pham had been missing since Monday and police issued an Amber Alert because it was believed the 17-year-old had been abducted. 

She left her family's apartment Monday morning and was walking to visit a friend at a complex next door but never made it. 

Shortly after she disappeared, her family received a ransom text message demanding money.

Police tell KPRC-TV in Houston they were able to trace that text message back to Pham's boyfriend, Luan Vu. They brought Vu in for questioning and say he began to confess and even offered up a motive.

"He was very open about what he had done, why he did it and where he put her," said Detective Fil Waters with HPD Homicide. "He was infatuated with Vy, they had a pretty passionate relationship and she had made some indications to him she had acquired a new boyfriend. His response to that was to assault her and take her to a place where he eventually killed her."

Waters said Vu lead detectives to a specific location Wednesday and told them that's where they would find Pham's body. The dive team entered the water just after 6 p.m. and recovered the body a short time later.  

"There are some indications on the body how the death occurred but we're not going to be able to discuss it. That's something an autopsy's going to have to do," Waters said.

Detectives said Vu told them he wanted to test their investigating skills and see how quickly they could solve a crime. "He wanted to see if we were as good as he heard we were." 

Vu is described by police as an intelligent video gamer. He's been in the country for five years and lives here with relatives. They were unsure if he had a job or went to school.