He probably got some pretty daming information at some point is why they threw in him jail in the first place. When he was traveling around the world most governments just left him alone.

I don't know the evidence right now and I don't know if we ever will, but if it was anything like the "Epstein suicide" we can be sure that, Cameras weren't working for some reason, the guards were "sleeping", and bunch of other things that are suspicious.