The real interviews like that with the guy are amazing.
They made a grade A shitty movie about him.
Don't watch that.
For those interested, go read Murder Machine about DeMeo and the Gemini Lounge crew. About 10 years back I worked with a guy who grew up in Canarsie, and was in his early 20's when Roy was in his heyday. Even then, people knew to stay away from crazy Roy. Those that didn't ended up in garbage bags.
I didn't see the Iceman movie; mostly because I remember seeing the interviews back in the 90's with Kuklinski. Nothing else compares, mostly because his complete lack of any feeling to the people he killed cuts thru you. Evil is devoid of empathy. So was Kuklinski.