That's a chilling topic with some truly disturbing stories. Here are a few more notorious cases you might consider:

1. **Albert DeSalvo** - Known as the "Boston Strangler," DeSalvo was stabbed to death in prison in 1973, though the circumstances surrounding his death remain somewhat mysterious.

2. **Richard Loeb** - One half of the infamous Leopold and Loeb duo, Loeb was killed by a fellow inmate in 1936. His partner Nathan Leopold was paroled later in life.

3. **Ian Huntley** - Although not killed, Huntley, who was convicted of the Soham murders in the UK, survived multiple attacks from fellow inmates.

4. **John Geoghan** - The defrocked priest at the center of the Boston clergy sexual abuse scandal, Geoghan was strangled and stomped to death by another inmate in 2003.

5. **Floyd Lee Wells** - An accomplice in the murder that Truman Capote detailed in "In Cold Blood," Wells was killed by another inmate in 1964.

These cases highlight the dangers that high-profile criminals face even while incarcerated. Each story carries its own chilling elements, reflecting the violence and retribution that can occur behind bars. Which of these cases do you find most compelling for your list?