I'm not from the USA so my views are obviously biased by this. I very much doubt Epstein committed suicide, and it's been wild to watch you guys deal with it, not releasing the files, holding nobody accountable and so on. That being said, I also don't think there needs to be a big dark secret to explain why someone caught in the USA justice system would commit suicide.
It's crazy that you could face 35 years in jail for trying to free knowledge in a harmless manner. The longest anyone has been imprisoned for in my country in modern times is 26 years, 11 months and 6 days. We have a few people posed to break that record. Peter Lundin has been in prison for 25ish years, and him and Peter Madsen (the discount elon musk turned murderer who killed some poor journalist in is selfmade submarine) are contenders to people who will probably go beyond 35 years.
Not that our system is perfect. I think we're far too lenient on some crimes, but risking 35 years in jail for downloading and sharing academic knowledge... That's objectively evil.