Maude Matilda Hughey Kemper and Edmund Emil Kemper

Victims: Maude Matilda Hughey Kemper, 66, & Edmund Emil Kemper, 72

Murderer’s age: 15

Deaths: August 27, 1964, North Fork, California

Edmund Kemper's grandfather as young man
Edmund Kemper's grandmother as young woman

Maude and Edmund were murdered by their own grandson after they had taken him in. The killer was released at age 21 and went on to murder eight other people.