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.

John Newman has spoken out following the death of Oliver Tree, and claimed more has to be done to protect artists.

The change saved Victor's life ... because all six people aboard the helicopter died after it collided with another chopper mid-air in Rio de Janeiro.