Singer Olive Tree dies aged 32 after collision of 2 helicopters mid-air in Brazil

American singer Oliver Tree has died at the age of 32 after a helicopter crash in Brazil's Rio de Janeiro. He was among the six people who died after two helicopters, reportedly an Airbus H125 (PR-DJJ) and a Bell 206B Jet Ranger (PP-MAC), collided mid-air on Sunday. Authorities are yet to release the details about the circumstances surrounding the collision.