For the third time, HBO cameras go inside Trenton State Maximum Security Prison--and inside the mind of one of the most prolific killers in U.S. history--in this gripping documentary. Mafia hit man Richard Kuklinski freely admits to killing more than … Richard Kuklinski, Park Dietz Added on HBO 2022-06-06.

Richard Kuklinski was a devoted husband, a loving father...and a ruthless killer. A decade after HBO last visited him in prison, the convicted murderer, who freely admits having whacked more than 100 people in cold blood, takes viewers back inside … Richard Kuklinski, Mark Musto, Rocco Fazzolari, Rich Lounello Added on HBO 2022-06-06.