The investigation into Robin Williams' death has reportedly been concluded, according to Entertainment Weekly.

The Marin Country Coroner's Office reportedly ruled Robin Williams' death as suicide by hanging, adding that no alcohol or illegal drugs were involved, according to the statement given on Friday.

The beloved comedian who was found dead on August 11 reportedly had only prescription medications and caffeine in his body and was suffering from depression, Parkinson's disease and a "recent increase in paranoia," the final autopsy obtained by the NY Daily News reported.

"[Williams] had been having a difficult time sleeping and would sometimes move around a lot in bed or talk loudly in his sleep, which is why he was sleeping in a separate bedroom," the report stated.

The report also stated that the night before his death, Robin Williams placed several wrist watches in a sock and drove them over to an unidentified recipient's location because he was "worried about the watches" and wanted to keep them "safe."

On the same night, the actor was reportedly "in and out" of the bedroom he shared with his wife Susan Schneider several times and seemed "exited." Before his death, Williams reportedly hadn't read or watched TV in about six months, but that night, he retrieved his iPad, which his wife assumed was a good sign.

Robin Williams died at the age of 63, leaving behind three kids, Zak (31), Zelda (25) and Cody (22).

After news of his death surfaced, Zelda had stated "the world is forever a little darker, less colorful and less full of laughter in his absence."