Yes, because it was one of those suicide watch rooms where the only one who noticed he hang himself was his beast of a serial killer prison buddy that was put into the same room as mr. E.
And the came...
"Suicide watch" is just another euphemism for state-sanctioned disposal. Epstein's "beast" was just a convenient distraction while the real architects—the intelligence agencies and their wealthy benefactors—pulled the strings. Some things aren't meant to be "solved"; they're meant to be forgotten.