Sources said Arthur March took investigators to an area just past Bowling Green, Kentucky on Friday to show them where he and Perry went in 1996 to dispose of Perry's wife's body.
Sources said Arthur told police he and Perry checked into a small hotel near in the area and that later that night, Perry stayed at the hotel while Arthur drove to a farm and placed Janet's body in a large brush pile. Arthur told police he thought the pile would be burned and the body incinerated.
Perry March has been indicted and jailed on murder charges in connection with Janet's disappearance, but Arthur has never been charged in the case. However, both men face conspiracy charges in a plot to kill Janet's parents, Lawrence and Carolyn Levine.
Sources told NewsChannel 5 that under the plea agreement, Arthur would serve 18 months in a federal medical facility in exchange for cooperating with prosecutors in the murder case against his son. That cooperation could include testifying against Perry in court.
Attorneys for all parties have declined to comment on the plea agreement, but sources told NewsChannel 5 that Arthur could sign the deal as early as Monday.