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.
westerfield was on trial for the kidnap, rape and murder of a seven year old girl that was a next door neighbor. Tons of evidence against him - her blood on his jacket, his motorhome bed headboard fibers in her hair, etc. Jury took 9 days to reach a verdict.
He is now facing death penalty. Penalty phase of the trial starts next week.