LOGANSPORT, Ind. (AP) — A convicted child killer who pleaded guilty to slaying a teenage girl has confessed to two other murders but will not face charges in those deaths, authorities said.

Prosecutors agreed not to press charges against Danny R. Rouse in the shooting deaths of two women in the 1970s as part a plea agreement under which he would be sentenced to life in prison without the possibility of parole for the murder of Stephanie Wagner.

Rouse, 52, pleaded guilty this week to killing Wagner, 16, whose body was found strangled and stabbed in a Cass County farm field on Nov. 1, 2006. At the time of her murder, Rouse was on parole from Kansas after serving 26 years of a life sentence for killing a 5-year-old boy in 1979.

Authorities said Rouse also confessed last week to the murders of Nellie Mikesell and Lela Donnelly Hildebrandt in Fulton County in the mid-1970s.

Mikesell, 72, was shot in the head with a small-caliber rifle while sitting inside her rural home in September 1974. Police determined she was shot from outside and the bullet passed through her living room window.

Hildebrandt, 26, was found dead in her car just off Ind. 17, south of Ind. 110 in October 1975. At first, police thought she had died of a head injury from the accident, but an autopsy revealed she had been shot. The shot, which went through the driver's side window, was fired from 10 feet away, investigators said.

Rouse offered no motive for the shootings, said Fulton County Prosecutor Rick Brown. "They were just spur of the moment killings. He didn't know either of the victims," Brown said.

Brown said Rouse had given authorities details of the case that only the killer would have known.

"In both cases there were details that I found compelling to the point where I have no doubt that he's the one that did it," Brown said.

Fulton County prosecutors made the deal with Rouse to solve two cases that otherwise might have gone unsolved and because of the proposed sentence from the Cass County murder case, Brown said.

"He cooperated in clearing those and admitted having committed them in a setting that we would probably have never been able to prove it otherwise," Brown said. "So, that's why we're not prosecuting him."

Rouse is scheduled to be sentenced in Wagner's murder on Dec. 14.