Sources tell TMZ that when the actor did not show up to work this morning, staffers at the show notified his landlord. When the landlord opened the door to Young's apartment, he discovered the body with a gunshot wound that appeared to be self-inflicted.
Officers responded and pronounced him dead on the scene.
Young first rose to fame playing the title character in Disney's The Famous Jett Jackson, about a teenage boy who plays a secret agent on a hit TV show.
After the series was canceled in 2001, Young had roles in movies including Friday Night Lights and Akeelah and the Bee. He also appeared on TV shows such as Smallville and Scrubs.
Actress Gabrielle Union had this to say about the talented actor:
I had the pleasure of working w/ #LeeThompsonYoung on Flash Forward & he was an extremely talented beautiful soul. My thoughts & prayers are with his loved ones #RIP