Oliver Tree, the eccentric singer known for viral hits like “Alien Boy” and “Life Goes On,” has died at the age of 32 following a helicopter crash in Rio de Janeiro.

The American singer-songwriter was among six killed when two helicopters collided in the sky above Recreio dos Bandeirantes, a beachside suburb of Rio de Janeiro, Brazil, on Sunday morning local time.

The outlet reported that five people were inside one of the helicopters, while the other was carrying only its pilot.