Robin Williams' tragic death in August has officially been ruled a suicide by hanging, and neither drugs nor alcohol were found to have played a part in the suicide.

Robin Williams

The Marin County, Calif. coroner released a statement declaring Williams’ death a suicide on Friday. The coroner also noted that illegal drugs and alcohol were not involved in the actor and comedian’s suicide. Prescription drugs were found in “therapeutic concentrations,” according to the coroner’s statement.

Williams was found dead on the morning of August 11 at his home in Tiburon, Calif. At the time, Marin County Assistant Deputy Chief Coroner Lt. Keith Boyd said in a press conference that it was believed he had died of a suicide by hanging.

For years, Williams had publicly battled alcoholism and depression. In recent years, he had been living a sober life, but he was still deeply affected by depression. The beloved actor had also recently learned that he was in the early stage of Parkinson’s disease. The coroner’s report stated he was experiencing "a recent increase in paranoia" as well as insomnia linked to his Parkinson’s.

Williams started out a stand-up comedian and went onto become a TV star on Mork & Mindy. On the big screen, his many notable roles include, Good Morning, Vietnam, Dead Poets Society, Hook, Mrs. Doubtfire, Good Will Hunting, World’s Greatest Dad and voicing the genie in Aladdin. His death was met with an outpouring of heartfelt tributes from his colleagues in the entertainment industry.

"People were drawn to him because of this electricity, this whatever it was that he radiated that propelled him and powered him," said David Letterman on his late night show. "Beyond being a very talented man and a good friend and a gentleman, I am sorry I—like everybody else—had no idea that the man was in pain and that the man was suffering. What a guy."