Well, in the story of hit man Donald 'Pee Wee' Gaskins. He was a serial killer who also worked as a hit man. He preyed on vulnerable people, often luring them with false promises. He committed his crimes in the South Carolina area. He used different ways to kill his victims, like shooting or stabbing. He was finally caught and convicted, and his story is one of the most terrifying examples of a hit man's deeds.
In the true story of a hit man like Jack Unterweger. He was an Austrian criminal. He was initially in prison for murder but after being released, he started killing again. He targeted prostitutes. His story is quite strange as he managed to gain some popularity as a writer during his time out of prison. But his true nature as a hit man was finally exposed when more and more victims were found, and he was held accountable for his heinous crimes.