Richard Kuklinski, otherwise known as the Iceman, was a notorious hitman between the 1960's and 1980's. Throughout his life he had close ties with the mob and claims to have killed hundreds of people until he was finally caught and sentenced to life in prison where he conducted chilling interviews revealing his murders.
Sources:
http://gomag.com/article/the_icemans_daughter14660/
https://www.history.com/this-day-in-history/operation-iceman-nabs-the-culprit
https://www.biography.com/crime-figure/richard-the-iceman-kuklinski
https://www.crimemuseum.org/crime-library/organized-crime/richard-kuklinski/
https://www.foxnews.com/media/undercover-agent-richard-kuklinski-mark-fuhrman
https://www.upi.com/Entertainment_News/2006/04/18/Former-FBI-agent-says-Hoffa-claim-is-hoax/37461145383774/
https://www.nytimes.com/2006/03/09/nyregion/richard-kuklinski-70-a-killer-of-many-people-and-many-ways-dies.html
https://www.imdb.com/title/tt0874289/
https://crimeviral.com/2020/04/10-chilling-facts-about-richard-the-iceman-kuklinski-2/
https://www.nytimes.com/1986/12/18/nyregion/jersey-man-charged-in-5-murders-linked-with-fake-business-deals.html
http://www.nypdconfidential.com/columns/2003/030227.html
https://www.wearethemighty.com/history/richard-kuklinski-mister-softee?rebelltitem=5#rebelltitem5
https://warehouse-13-artifact-database.fandom.com/wiki/Robert_Pronge%E2%80%99s_Ice_Cream_Scoop