Sprague said that the deal helped in two areas for the family of June Collard.
"They wanted their mother's remains back as quick as possible, which was never going to happen in a trial," Sprague said. "Tammy Vanderwerker (Collard's daughter) wanted to hear it from his mouth."
June Collard was reported missing from her Olmstedville Home in November of 1980. At the time, Mr. Collard said that her wife had run off to Texas with a male friend.
However, suspicions around the community often pointed the finger at the husband, who living in a Samson, Ala. prison when New York State Police officers visited with him and then re-opened the investigation into his wife's disappearance.
Mrs. Collard's remains were found a short time later, leading to Collard being charged and eventually accepting a plea deal.
In court Feb. 3, Collard declared that he had hit his wife during an heated argument in the kitchen at their home. The force of the punch sent her through a door, striking her head on a hot water tank.
Mr. Collard said he then checked for vital signs and, upon finding her apparently dead, dumped her out of a bathroom window into a pit, covering her remains with dirt and Lime in order to mask the smell.
Sentencing in the case is scheduled for March 31.