Lee Thompson Young — who played the main character on Disney’s “The Famous Jett Jackson“ — has died after committing suicide … TMZ has learned. He was 29.

Sources tell us Young’s body was discovered with a gunshot wound that appears to be self-inflicted.

Young currently appears in the TNT show “Rizzoli & Isles” — and we’re told when he didn’t show up to work this morning, staffers called the landlord of Young’s L.A. home to check up on the actor.

We’re told … when the landlord opened the door, he discovered Young’s body. “

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via TMZ