A medical examiner in Minnesota ruled the death of Rangers enforcer Derek Boogaard was an accident, due to mixing alcohol and oxycodone. The Hennepin County Medical Examiner released Boogaard's cause of death on Friday. The medical examiner said no other data will be released. The 28-year-old Boogaard was found dead in his Minneapolis apartment last Friday, five months after he sustained a season-ending concussion.