American pop artist Oliver Tree was among six people killed in a tragic mid-air collision involving two helicopters in Brazil.

American alt-pop singer and internet personality Oliver Tree was aboard one of the two helicopters that collided mid-air in Brazil, leaving six dead. The musician was known for hits such as "Miss You" and "Life Goes On." He had over 11 million  monthly listeners on Spotify, with his top songs listened to over 700 million times.