Cold Case Cops Try To Solve A Nearly Decade-Old Mystery

The Arthur March we had known over the course of this story has always seemed full of life, always a force to be reckoned with. When 48 Hours meet with him months after his arrest, he seemed a totally changed man.

Arthur March denied conspiring with his son to have the Levines killed. "I never talked to them. Never talked to my son about it," he said.

"When you listen to those phone calls, it sure sounded like you were in on it," Lagattuta remarked.

"Well, it does. I have a big mouth. And I probably said something things I shouldn't have said," March replied.

But Arthur March had only begun to talk. Facing the rest of his life in jail, Arthur was about to give police the kind of break they never dreamed they'd get.

"He offers to give, to plead guilty to the conspiracy charge. To give us all the information and cooperate with the investigation pertaining to Janet's death. And testify against Perry if necessary," Postiglione explains.

In exchange for a lighter prison sentence, Arthur March agreed to tell all he knew about his daughter in-law Janet's disappearance in a videotaped deposition.

"The first time that Perry told me about it was at the house when he asked me to clean up. He was afraid there was some blood stains," Arthur March testified during the deposition.

"Did Perry tell you that he had killed Janet?" Lagattuta asked March.

"Yes!" Arthur March replied.

March said his son had told him they had had an argument. "She grabbed a butcher's knife or a kitchen knife and came at him, and he picked up a wrench, small wrench. And hit her with it. And he hit her too hard, and she, she was dead," he told Lagattuta.

Arthur March says his son told him it was an accident and that he believes that version of the story.

As the weeks went by, Perry March kept up the charade that he had nothing to do with Janet's disappearance. Then two months after she went missing, Janet's burial site suddenly didn't seem so safe anymore. The heavily wooded area where her body had been placed, was about to be developed. Fearful that she would be discovered, Perry March needed to cover his tracks, and so he turned to the one man he knew who would be there to help him: his father.

"The only thing I did was help him remove the body from where he had buried it," Arthur March recalls.

The body had been buried just a few miles from the March house. "I picked it up, the body, and it was nighttime. I had one little flashlight. But I got it done," Arthur March explains.

Perry March, meanwhile, sat in the car while his father went to get Janet's body. They put the trash bag containing Janet in the trunk of the car, and according to Arthur, drove to Kentucky.

Arthur March dropped Perry off at a motel and continued on, looking for a remote spot to dispose of Janet.

"I was gonna put it in water, like a stream. But I found there wasn't enough water in it. So that's when I took it back, and I saw this pile of brush. And I got the idea, 'Well, that's the best way to get rid of the body, 'cuz nobody'll ever find it.' And that's what I did," Arthur March remembers.

And he was right. Arthur March later tried to help detectives locate the spot where Janet was buried but they never were able to find her body.