Plus, there's no indication he had any information that the government would need to kill him to keep secret. It was just tax evasion charges and maybe drug dealing.

Fair I guess, ideally you wouldn't say "I'll never kill myself and if I do I didn't" and then do it, but he probably wasn't the most stable and reliable person. It sucks if he really didn't do it because now it's pretty easy for any interested parties to make this argument.