Stephan Bonnar died of an accidental drug overdose.
The Clark County (Nev.) coroner’s office ruled Bonnar’s death accidental from “Fentanyl, Parafluorofentanyl and Mitragynine intoxication” in an email sent to MMA Fighting after a public records request following the UFC Hall of Famer’s death on Dec. 22 in Las Vegas. He was 45.
Coroner: Stephan Bonnar, UFC Hall of Famer, died of accidental fentanyl overdose - MMA Fighting