Hairston, 59, of Allegheny County, was convicted of two counts of first-degree murder and sentenced to death for killing his wife, Katherine, and their teenage autistic son, Sean, in June 2001. He is scheduled to be executed on Tuesday, Oct. 19.
In August 2008, Rivera, 28, was convicted of the shooting death of Reading police officer Scott Wertz. Officer Wertz was pursuing Rivera after responding to an altercation outside of a local convenience store in August 2006. Rivera was believed to have fired gunshots during the fight. Rivera's execution is scheduled for Wednesday, Oct. 20.
Chambers, 38, was sentenced to death in May 2005 for murdering three-year-old Porchia Bennett in Philadelphia on Aug. 16, 2003. His execution date is scheduled for Thursday, Oct. 21.
With the warrants signed today, Governor Rendell has now signed 113 execution warrants. Pennsylvania's method of execution is lethal injection.