Since you're a stickler about spelling IAAL, that's Jeffrey DAHMER. (Sorry - I couldn't resist.)
And yes, he and another guy were beaten to death in prison. The other guy was found guilty of murder, having stabbed his wife to death (47 times in the face if I recall correctly) in a restaurant parking lot and then tried to blame in on a gang of black teens.
Couldn't have happened to two nicer guys.