U.S. singer Oliver Tree presumed dead in Brazil helicopter crash that killed 6 CTV NewsUS musician Oliver Tree dies in helicopter collision in Brazil BBCUS musician Oliver Tree, 32, killed in helicopter crash in Brazil The GuardianVideo: Helicopters crash over Rio de Janeiro, killing six The Globe and MailOliver Tree, “Life Goes On” and “Miss You” Singer, Dies in Helicopter Crash at 32 The Hollywood Reporter
