I have a theory
Epstein technically wasn't murdered.
His lawyers lobbied to have him taken from suicide watch at the end of July.
They wouldn't have done that unless HE PERSONALLY directed them to.
Then there's the matter of the person who wasn't even staff on the station that night (still looking for confirmation but I believe I saw it on a news report)
I think he was attacked the first time and was told the rest would come when he gets out of protection.
The feds don't need him because they already have the photos and CCTV footage, and his meticulous diaries.
He wasn't getting any deals.
He paid for that guy to be there, who took care of the camera, made Epstein unconscious peacefully (does this smell like chloroform to you?) and set him in a ligature made of his trousers against the bars, and then left.
Epstein paid for his assisted suicide because he knew what was coming.