The FBI has opened a formal investigation into how US financier Jeffrey Epstein was able to apparently kill himself in prison while awaiting trial on sex trafficking charges.
His body was discovered early on Saturday at a facility in New York.
Last month Epstein was found semi-conscious in his cell after an apparent suicide attempt.
New York Mayor Bill de Blasio said it "way too convenient" that Epstein could no longer incriminate others.
"What a lot of us want to know is, what did he know?" Mr de Blasio, who is also running for the Democratic presidential nomination, told reporters in Iowa.
"How many other millionaires and billionaires were part of the illegal activities that he was engaged in?
"Well, that information didn't die with Jeffrey Epstein. That needs to be investigated, too."
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