How do they know it was suicide if nobody was watching him at the time?
Someone was watching, if not the guards. He was on suicide "watch", where one or more people watch it.
Folks with lots of information that would incriminate big shots commit a lot of suicide.
Suicide is possible especially if the officers are skipping rounds. Epstein was locked in a single cell. Sliding door, no bars, found in a fetal position. He was likely found at the end of shift or shift change. That points to staff not doing good rounds.....Plenty of time for self harm. or someone snapped his neck and locked the cell...Great mystery..