Bobby Driscoll was an Academy Juvenile Award winner. He voiced Peter Pan and even served as the model for the character in the 1953 movie. He made over $50,000 a year as a teenager in the entertainment industry, but he spent most of it on illicit substances. He died penniless, unclaimed, and unidentified in an abandoned apartment building in New York City at 31. Because no one could claim his body, he was buried in an unmarked grave. It wasn't until over a year later that his mother (and everyone else) discovered what actually happened to him, thanks to a fingerprint match from the police station. This heartbreaking Wikipedia page recounts all of those events.