And there was a man who poisoned people by injecting them with gas ("mazrik haneft").

There were also some spree killers, who killed several people one after the other - one of the famous ones being Menachem Mandelbrott, in the fifties, on whose case the famous Mandelbrott rules of criminal insanity were based.

(hey, you want gory crime facts, I want to take a break from work)