MANITOWOC, Wis. (AP) - A teenager who admitted to police that he raped a woman tied to a bed, slit her throat and helped his uncle burn her remains also said he regretted what he did, a videotaped interview played for jurors on Friday shows.

Brendan Dassey, now 17, is on trial for raping and killing 25-year-old Teresa Halbach and burning her body near the family's rural auto salvage lot on Oct. 31, 2005.

A jury convicted Dassey's uncle, 44-year-old Steven Avery, last month of killing Halbach, rejecting Avery's contention that he was framed by the same sheriff's department that helped wrongly put him behind bars for a 1985 rape.

"I feel really sad because I helped him," Dassey told investigators, referring to Avery. "I feel sad for the family because they lost a daughter."

Halbach disappeared after going to the yard in rural Manitowoc County to photograph a minivan that Avery's sister was selling through Auto Trader Magazine. Avery had called that morning to request the photo, testimony showed.

In the three-hour video — which Dassey has recanted — the teenager answers questions as he slouches on a purple love seat in a sheriff's department interview room, never displaying any emotion.

Dassey said Avery asked him if he wanted to have sex with Halbach — "If I wanted to try it" — and the teenager, who had just returned home on the school bus, first declined.

At one point, Dassey was asked whether he saw Halbach in the fire as she was burning up. "Just the forehead, the hands and feet and a little bit of the belly," the teen answered.

The admissions were made after two detectives, Tom Fassbender and Mark Wiegert, repeatedly urged the boy to the tell the truth, suggesting to him that they already knew what happened.

Dassey's attorneys contend the two seasoned detectives coerced the teen, who they describe as having a low IQ, into giving a false confession. After recanting the confession, Dassey refused to testify against Avery at his recent trial.

Under cross-examination by Dassey's attorney, Wiegert said the detectives asked the teen leading questions, lied about some things, told the boy that they didn't believe him and made some promises to him in their effort to get the truth.

Avery, who is awaiting sentencing in June, previously served 18 years in prison for a 1985 rape that DNA evidence later showed he did not commit. He has claimed he was being framed by the same sheriff's department that put him away in the 1985 case.

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