The timing does make me suspicious. I'm generally willing to believe he was "suicided" by some shadowy conspiracy. But if that's what happened, why would they do it on the day his extradition was approved?

If our secret ninja assassins wanted to take him out because he Knew Too Much or whatever, they could do that any old time. Why do it on the day his extradition was approved instead of some random day 6 months ago or something.

On the other hand, it seems much more reasonable that a man whose extradition to the US to face Federal Criminal charges was just approved might suddenly decide to kill himself rather than deal with that.

Unless of course the Secret Ninja Assassins knew that and decided to kill him today to make it look less suspicious. But then we're really getting into the weeds of conspiracy, where any crazy thing we could dream up might have happened.