A man acquitted in court nearly 15 years ago of murdering a 2-year-old boy has confessed to police that he was actually guilty of the crime.

But because of double jeopardy — meaning a person cannot stand trial twice for the same crime — he will walk away without serving any prison time for the homicide.

Michael Lane, now 41, stood trial in 1991 on a charge of second-degree murder in the death of Paul "PJ" Eugene Watts. Lane was baby-sitting the boy for his live-in girlfriend, Jennifer Watts, now 32, at her Salt Lake home while she went to church. When she returned, she found the toddler unresponsive in his crib.

In court, the Utah Medical Examiner's Office testified PJ received at least seven blows to his head and died as a result.

But Lane was acquitted in 3rd District Court when the defense convinced a jury that the boy's injuries could not be pinpointed on Lane.

The jury deliberation took four hours because one juror did not agree with the others but reluctantly changed her vote after much debate.

"I think he was guilty. I think I may have made a mistake," said the juror shortly after the verdict was read. The juror asked in 1991 to remain anonymous. "It's so awful. A little child was murdered. There wasn't any question of that. I feel really bad. The killer's gone unpunished."

It turns out the juror was right.

In August 2005, Lane contacted Salt Lake City homicide detectives, saying he wanted to talk to them about PJ's murder. He was prompted to speak to police after reportedly confessing to his bishop what he had done, Salt Lake City police detective Dwayne Baird said.

"He stated he wanted to 'clear this up and get it off my conscience and on the record and do the right thing,' " Baird said. "The reason he (confessed) was to clear his conscience and repent of his sins."

Lane sat down with two detectives at Salt Lake City police headquarters and confessed what really happened in a conversation that was recorded on tape.

"He said he was high on meth. He was going to change (PJ's) diaper but the baby wouldn't stop crying," Baird said. "That made him upset, and he slammed the baby to the floor."

PJ stopped crying momentarily, but when he started crying again Lane slammed the small boy against the floor several more times, Baird said.

"He had him in both hands and just slammed him down on the floor on his back . . . throwing him back from about 14 to 20 inches off the ground," Baird said. "He admitted he was rough with the child, and he was just getting him to stop crying."