Did Epstein ever cooperate with federal prosecutors?

No. Jeffrey Epstein never cooperated with federal or state prosecutors. The 2008 agreement was a non-prosecution agreement with the federal government (not a cooperation deal) and a separate state plea. Epstein did not provide information about associates, clients, or other participants in his network. After his 2019 federal arrest, some observers speculated whether Epstein might offer cooperation in exchange for bail or reduced charges, but he died before any such arrangement materialized.