We all remember Jefferey Dahmer, the Milwaukee man who was convicted of murder rape, dismemberment, and cannibalization of at least 17 young men in the late 80's. He was sentenced to multiple life terms. While serving them, another inmate, Christopher Scarver, beat him to death.
He has given an interview for the first time, saying that he was "fiercely disgusted" by Dahmer's crimes and one day, after he had been standing in line in front of him, he lost his temper after Dahmer and another inmate gave him a slight nudge. His weapon of choice was a metal rod from the weight room. Scarver claimed Dahmer taunted guards and arranged his food to look like severed limbs, covering them in ketchup to look like blood. He also claimed the guards mysteriously vanished when he killed Dahmer, hinting that they were somehow aware of what was going to happen and were okay with it. Interesting stuff. Here are some links for you. The interview, and Dahmer's Wikipedia page.