Oliver Tree, the California-born singer-songwriter 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.

Oliver Tree 's mom is remembering her son with a heartbreaking tribute following his tragic death in a helicopter crash.

As you know, Oliver and 5 others were killed after two helicopters collided above an electric vehicle yard in Rio de Janeiro, Brazil ... with both choppers immediately bursting into flames and crashin...