‘The Famous Jett Jackson’ Star Lee Thompson Young Dead at 29

Sources tell us Young's body was discovered with a gun shot 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.

Stay with TMZ for more as it develops.