PLAINFIELD, NJ - A Plainfield man has been found guilty of the 2013 murder of his mother.

John Quackenbush, 47, was found guilty of beating his mother to death in the home they shared a little less than three years ago, acting Union County Prosecutor Grace H. Park announced Wednesday.

Plainfield Police Division officers responding to a request for a welfare check found the body of 69-year-old Gail Vandewalle under a blanket in her Watson Avenue home on Feb. 24, 2013, several days after her last known contact with friends or family members.

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An autopsy by the Union County Medical Examiner’s Office revealed that Vandewalle died of blunt-force trauma to the head caused by a 12-pound dumbbell. A fast-moving investigation by the Union County Homicide Task Force and the Plainfield Police Division resulted in Quackenbush being identified as a suspect, and he was arrested on February 25, 2013 at a motel in nearby Green Brook. Quackenbush was held on $1 million bail leading up to his trial.

Sentencing in the case has been scheduled for March 18. Convictions on first-degree murder charges result in sentences of up to life in state prison.