No BB this was after Cutty got out at the start of S3 (he was in S2 towards tehn end anyway?).
He was gifted a package and gave it to a guy to sell, the guy stiffed him and (I think it was him) got killed. I’ll have a watch!
It was Fruit that stiffed Cutty on the package but when Cutty had the chance to kill him he didn’t and that’s when he realised he was out the game. Cutty didn’t kill anyone after being released.
The scene you’re talking about is after the dog fight. Tree, wearing a grey tracksuit, walks up behind the guy and shoots him in the head then says “woof” to the two guys left standing there.
Trust me, remember I’ve watched the entire thing from start to finish 8 times. 😆