Exclusive: Confessed Killer Says He Didn't Do It

A man who pleaded guilty but mentally ill to murdering a social worker says he didn't do it.

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Christopher Luttrell sat down for his first one-on-one interview since he and girlfriend Renee Terrell were arrested for the murder of Boni Frederick in 2006.

His own attorney said you never know what's going to come out of his client's mouth. On Tuesday, Luttrell gave what he said would be his last interview to tell the community what he says is "the truth."

"If I even touched that woman I'd admit to it right now," said Luttrell. "Because that's what God would want."

But Luttrell has admitted to killing 67-year-old Boni Frederick before -- to the media, and to a judge.

Now Luttrell said he was holding Renee Terrell's son, Saige, while she was in another room killing the social worker. Luttrell said Terrell opened the door covered in blood, telling him they had to leave.

"I said, 'What did you do to her?' She didn't make no statement or remark to me," said Luttrell.

But later, Luttrell told us his girlfriend did say something, this time with a skillet in hand.

"I remember her walking back out with it in her hand," he described. "She tried to get me to finish her off. I told her, 'Uh-uh.'"

"If you're asking me do I believe that's exactly what happened, the answer's no," said commonwealth's attorney Bill Markwell, who believes the truth lies in a 50-page manuscript Luttrell wrote in jail. Markwell said Luttrell was actually hiding in a closet waiting for Frederick.

"He came out with the cord and some mace to disable her. Then the violence escalated," Markwell said. "[Terrell] provided him two knives and a frying pan which he and she, we believe, proceeded to utilize on Ms. Frederick."

Even Luttrell admits he wouldn't believe his story if someone else told it. He said he changed it to protect his girlfriend.

There's one undisputed fact he wishes he could change.

"To Boni, I wish I could tell her right now that I'm sorry for not helping her," he said. "I wish I could've done anything to help her."

Frederick's slaying led to the passing of the "Boni Bill," which earmarked millions of dollars for new safety procedures for social workers.

A judge determined Luttrell couldn't legally face the death penalty because his IQ was under 71.

The commonwealth's attorney plans to use this interview in the case against Terrell. Her trial begins in September.