When a celebrity dies young, we're sad to see a life end too soon – and often haunted by the life and career that could've been. Popular in life, young Hollywood stars Jean Harlow, James Dean, Heath Ledger, and River Phoenix became icons in death. Music has lost its share of greats, too: Hank Williams, Otis Redding; Buddy Holly, Ritchie Valens, and The Big Bopper; Janis Joplin, Jim Morrison, and Jimi Hendrix; Kurt Cobain, Amy Winehouse, and DJ Avicii. We remember legends and budding stars from film, television, music, and sports gone much too soon with a photo gallery of celebrities who died before the age of 30.