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.

Oliver Tree's mother is speaking out about her son's tragic death.

A list of just some of the lives lost in such accidents includes: Patsy Cline — Piper PA-24 Comanche small airplane crashed in bad weather on March 5, 1963, killing Cline, 30, and fellow country artis...