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 2023-06-27, leaving 2024-03-31.