TMZ caught up with Giovanni Russo (he played Carlo in Godfather 1, and is pretty close with some people in the life. Tommy Belotti was the best man in his wedding and Castellano was a friend of his, too). He said he wasn’t friends with Cali but met him a few times. He said he didn’t think it was an internal Gambino thing because they never woulda killed him like that. He said he thought Cali was making a lot of money in drugs, and was probably hurting the bottom line of whoever did it.

https://youtu.be/6qIXFtCvew8