Musician Oliver Tree and Argentine YouTuber Gaspi were reportedly among the identified victims American singer Oliver Tree was among the six people killed when two helicopters collided over southwest Rio de Janeiro on Sunday, Globo1 and CNN Brasil have reported, citing local police. Firefighters were called to the scene of a collision involving two aircraft at around 9 am. Acting Rio de Janeiro State Governor Claudio Castro confirmed that all six people aboard were killed. Tree and Argentine