Reddit mentions of The Co-Ed Killer: A Study of the Murders, Mutilations, and Matricide of Edmund Kemper III

What was your grandmother like? Did she seem at all troubled by her upbringing?

unfortunately, people in this sub probably have more interest in Ed as a morbid oddity than as a person, if that's what you're looking for. I recommend reading Margaret Cheaney's book (this one) if you're looking for an in-depth analysis of him that's not as sensationalized. There's also his prison interview, if you want to hear his own take on things.

He also has narrated numerous audiobooks while he's been in prison, though I'm not sure which ones. Hope this helps!