Stephan Bonnar died on December 22, 2022, at age 45. The UFC first said it was presumed heart complications, but later reporting said the Clark County coroner ruled it an accidental fentanyl overdose involving fentanyl, parafluorofentanyl, and mitragynine.

What happened

  • He was a former UFC Hall of Famer and a major figure from The Ultimate Fighter 1.
  • His death was first announced without a clear cause, then updated after the coroner’s findings.
  • Earlier reporting also noted he had a history of substance-related and legal issues, including a DUI arrest in 2018.

In context

Bonnar is remembered most for his legendary fight with Forrest Griffin, which helped popularize the UFC. His death prompted a strong reaction across the MMA world, with many fighters and fans mourning him.