MINNEAPOLIS (AP) — The death of Rangers enforcer Derek Boogaard was an accident, due to a toxic mix of alcohol and the powerful painkiller oxycodone.

The Hennepin County Medical Examiner announced Boogaard’s cause of death Friday, saying it was unclear exactly when the 28-year-old died. Boogaard was found dead in his Minneapolis apartment last Friday.

, five months after he sustained a season-ending concussion with the New York Rangers.