IT WAS HIM:

Wayne Wolfe who, less than a year ago, discovered that his real grandfather was the deceased killer Ed Edwards who was convicted of five cold cases in his 70s.The series examines the infamous murderer through an investigation led by Wolfe and John Cameron, a cold-case expert and retired detective who has been investigating Edwards for almost a decade. Cameron’s meticulously compiled evidence has Edwards as the ultimate suspect in some of the most well-known murder cases, including the Zodiac Killer, Laci Peterson and many more.