Ed Kemper

Edmund Emil Kemper III (born December 18, 1948), is an American serial killer, suspected cannibal and necrophile who committed the murder of numerous women in the early 1970s, as well as the murders of his mother and paternal grandparents. He killed up to 10 individuals in total. 
Kemper is widely known for his high intelligence and giant stature, standing 6 foot 9 inches (or 2.06 m) tall and having an IQ of 145, features that left his victims with little chance to overcome him.