Ok, this can be logically deducted. :wacko:
Brad is the obvious choice....which means, it isn't Brad.
Brad took a cab to Luxumberg (?) right after leaving Neil's apartment. Jerry was there. So, it can't be Jerry....not enough time. Anyway, why would Jerry go to the meeting place if he has killed Neil???
Robbie is too sweet and innocent to kill anyone.
Lou is clueless to all these goings-on.
JP couldn't have been involved. He was in the US and had no idea Neil was in France....unless, of course, he had someone tailing Brad and Robbie for security reasons....which I will discount as not likely.
Neil killing himself just doesn't fit. He still had plans in motion.
Ergo, Marcel is the perp. He loves Brad like a brother. I mean, Brad saved his cute butt. So Marcel must have seen Brad, who was really upset that Robbie had left, leave the apartment and followed him. After Brad left Neil's apartment, Marcel went in and found Neil regaining conciousness. That's when Marcel fisted Neil to death....or something like that.
I'm so clever.