Robin Williams gestures during a panel discussion for his upcoming HBO show "Robin Williams: Weapons of Self-Destruction" at the Television Critics Association Cable summer press tour in Pasadena, July 30, 2009.
Robin Williams gestures during a panel discussion for his upcoming HBO show "Robin Williams: Weapons of Self-Destruction" at the Television Critics Association Cable summer press tour in Pasadena, July 30, 2009. Reuters

The late comedian and actor Robin Williams had not consumed any illicit drugs or alcohol just before his suicide. The same has been revealed based on his autopsy report released by Marin County sheriff's office, which states that the actor was absolutely sober at the time of his death.

The autopsy report disclosed that the late actor had only taken prescription medication, which was determined to have been taken according to therapeutic concentrations, as told by the USA Today. On the whole, he had four drugs in his system--two anti-depressant and two caffeine compounds. It can now be officially stated that the actor was not under the influence of any drug or alcohol at the time of his suicide.

On Aug. 11, the actor was found dead in his California home. He was last seen by his wife a day before the shocking incident. The Oscar winning actor was found hanging by his belt in his room by his assistant. He was 63 at the time of his death.

The investigation concluded that the actor died from asphyxia due to hanging. He was reportedly suffering from depression and was seeking treatment for the same. The investigations launched following in the actor's death concluded the cause as suicide and not due to any other substance abuse.

The news struck the chord with his numerous fans as well as researchers of bipolar disorders. The shocking news of a fine actor committing suicide also triggered public debate on the mysterious link between genius and extreme behavioural traits.

Williams had long battled the issues of depression, alcoholism and drug addiction in the later years of his life. USA Today also reported that shortly after his untimely death, his widow Susan Schneider informed that the actor had been recently diagnosed with early signs of Parkinson's disease.

The news of his shocking death was received with worldwide tributes offered by fans coming from all walks of life. US President Barack Obama also gave the statement expressing his grief saying that the Williams "made us laugh. He made us cry."