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The Famous Jett Jackson actor's longtime manager, Jonathan Baruch, told E! News that the 29-year-old "tragically took his own life this morning."
He added, "Lee was more than just a brilliant young actor, he was a wonderful and gentle soul who will be truly missed. We ask that you please respect the privacy of his family and friends at this very difficult time."
Costars of the actor have come forward via Twitter to send their condolences to the Young's friends, family and loved ones.
Take a look at what more stars had to say: