Oliver Tree, the California-born singer-songwriter and rapper known for tracks like "Life Goes On," "When I'm Down" and "Miss You," died in a helicopter crash in Rio de Janeiro, according to CNN Brazil.

The alt-pop US musician and internet personality Oliver Tree was among six people who died when the helicopter he was travelling in collided with another in Brazil.

American singer and comedian Oliver Tree was listed as a passenger on one of two helicopters that collided midair and crashed Sunday morning in Brazil, killing all six people aboard, authorities said.