Former Disney star Lee Thompson Young DEATH CERTIFICATE RELEASED

                         

Lee Thompson Young 29,died from a self-inflicted gunshot wound to the head ... this according to the actor's official death certificate obtained by TMZ.

Young's body was discovered at his North Hollywood apartment on August 19th, after he failed to show up to the set of his TNT drama "Rizzoli and Isles."

According to the death certificate, Young used a handgun to take his own life. 

Young's friends and family are still struggling to understand why the actor shot himself though some of his family members told law enforcement he suffered from "depression issues."