Even in Ankh-Morpork this man was a notorious murderer.
He apparently did things so horrible that the jury at his trial vomited so much it had to be postponed. Even the warders at the Tanty were horrified at the things he did and one was reduced to tears. These are prison officers we are talking about here. He did one thing that was so beyond the pale that even today staff - and other cons - only refer to it in hushed whispers. He was easy meat for the Cunning Man to possess, and met his end, cleansed with fire in a stubble field in The Chalk.