Kuklinski was going to indict Gravano on Calabro's (Dirty Cop) murder. Calabro supposedly killed his wife but they couldn't prove it. Her Family went to Gravano and asked for the hit. Knowing he was a cop, Gravano had to hand off the hit to a non member of the Mafia because of the rules...Back when Kuklinski died all the papers in New York stated how Gravano got away from going to trial on Kuklinski's revelations that ended with Kuklinski's sudden death. Some are Facts that I'm aware of, Some is hear say. Maybe Kuklinski didn't like how Gravano became a rat and was getting off, that would be good enough for me to accept.