American singer Oliver Tree, whose infectious electro-pop songs attracted millions of fans across the world, died Sunday morning in a helicopter crash that killed six people in Rio de Janeiro.

A midair collision involving two helicopters occurred several miles west of downtown Rio de Janeiro in the beach community Recreio de Bandeirantes. Inside the helicopter that carried Tree, 32, were four other passengers, all of whom were also killed. The pilot of the other helicopter also perished.