There is certainly much uncertainty concerning his apparent suicide.
https://www.nytimes.com/2019/08/11/nyregion/epstein-death-manhattan-correctional-center.html:
In addition, the jail had transferred his cellmate and allowed Mr. Epstein to be housed alone in a cell just two weeks after he had been taken off suicide watch, a decision that also violated the jail’s normal procedure, two officials said.
The disclosures about apparent failures in Mr. Epstein’s detention at the Metropolitan Correctional Center deepened questions about his suicide and are very likely to be the focus of inquiries by the Justice Department and the F.B.I.
Officials cautioned that their initial findings about his detention were preliminary and could change.[my bold added]
Here is an article (op-ed) going more into details about standard procedures with regards to suicide prevention:
https://www.washingtonpost.com/opinions/2019/08/10/jeffrey-epsteins-apparent-suicide-is-unfathomable/