JOLIET – Drew Peterson’s son testified Wednesday at his father’s murder trial that he never believed his dad killed his mother.

The 19-year-old child of the former suburban Chicago police officer and his third wife, Kathleen Savio, was the last witness to testify for the defense, which rested its case Wednesday after presenting three days of testimony. Just before the defense, Drew Peterson stood in the courtroom to tell the judge he had chosen not to testify.

Peterson has pleaded not guilty to first-degree murder in Savio’s 2004 death, which was initially ruled an accident. Her death was re-examined and reclassified a homicide only after his fourth wife, Stacy Peterson, disappeared in 2007.