Another ET entry by me, from 1926: Tony Vettere, the last man executed in Butte, Montana. He went on a shooting spree, killing three people and wounding another, and when they were going to execute him he fought back with a pipe and a sharpened spoon and they had to gas him and haul him, more or less unconscious, to the gallows.
I think the gallows is probably exactly where he needed to be. Too dangerous to let out, too dangerous to keep in prison.
Certainly he was a very dangerous man, but even then people had qualms about executing him, including the sheriff, on account of the fact that he appeared to be batshit insane.