Yes, Ed Kemper's mother, Clarnell Kemper, was known to have physically abused him during his childhood. Ed Kemper is a notorious American serial killer who murdered ten people, including his grandparents, mother, and six young women in the early 1970s.
In his confessions and interviews, Kemper revealed that his mother was emotionally and physically abusive towards him. She was known to belittle and humiliate him, and there were instances of her physically assaulting him as well. This troubled and abusive relationship with his mother has been considered a significant factor in shaping Kemper's violent behavior and disturbed mindset.
It's important to note that abuse is never an excuse for committing crimes or acts of violence, but understanding the troubled backgrounds of individuals like Ed Kemper can shed light on the complex factors that contribute to criminal behavior.