Robin Williams' death has been officially ruled a suicide, Marin County authorities said on Friday (November 07) following an investigation and toxicology tests on the comedian's body.

The Oscar-winning actor, whose body was found on August 11, died of asphyxia due to hanging, the Marin County Sheriff's Office said in a statement. That was the same finding sheriff's officials made in their preliminary conclusion.

In addition, toxicology tests on Williams' body revealed the absence of alcohol or illicit drugs, and prescription medications were detected in concentrations consistent with their use for therapeutic purposes.

Williams was one of the world's most famous comedians. He also earned an Oscar for his role in the 1997 drama "Good Will Hunting."