Issei Sagawa

A cannibal named Issei Sagawa has profited from his crimes. After murdering and eating his classmate in 1981, he was released due to a loophole. The Japanese wanted to detain him and the doctors even said he should be in prison, but they couldn't legally detain him without the court documents from France (his victim was a French citizen), which France refused to turn over. He has since then translated his fame into books, talk show appearances, and even softcore porn films in which he bites his co-stars.