Williams had antidepressants, caffeine and Parkinson's drugs in his system 
 
 Robin Williams' death was ruled a suicide, Marin County officials confirmed on Friday. Autopsy results revealed Williams' death was caused by asphyxia and hanging. 
 
 The actor died at 63 on Aug. 11 at his home in Tiburon, Calif. in Marin County. Toxicology reports reveal antidepressants, caffeine and levodopa, a drug used to treat Parkinson's disease, in his system. Williams had battled severe depression for years and had recently been diagnosed with Parkinson's, his widow, Susan, revealed after his death. He also had a "recent increase in paranoia," according to a medical history authorities recorded at the scene. 
 
 The night before Williams died, he had placed several wristwatches in a sock and dropped them off with someone (whose name was redacted) because he was worried about the timepieces and "wanted to keep them safe," according to the report. Then at 7:09 p.m. he called Susan to tell her he was picking up magazines for her at the bookstore. 
 
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 When he returned home, Williams handed Susan the magazines and seemed "OK," she told investigators. Then he was in and out of their bedroom, rummaging through their closet. He left with his iPad, and Susan said "she recalled thinking it was a good thing he grabbed it, because she assumed he was in a good mood and was going to take time to do some reading; he hadn't read or watched TV in six months." He left the bedroom around 10:30 p.m. — it would be the last time she saw him. 
 
 Twelve hours later, Susan believed her husband was still sleeping and left the house. At about 11:45 a.m. Aug. 11, Williams' assistant grew concerned. He slipped a note under the door, then picked the lock. He found the comedian dressed in a long black T-shirt and belted black jeans hanging by a nylon belt in a closet door frame. The actor, who was being treated for severe depression, also had cuts on his wrist. He wasn't wearing a ring or a watch. 
 
 Williams was found in an empty bedroom belonging to his stepson, who was away visiting his father. The actor slept in a separate bedroom because he was having a hard time sleeping and was "restless due to his Parkinson's and anxiety issues," and talked in his sleep, the investigator's report says. The room had a bunk bed — the top bunk was neatly made — the bottom bunk crumpled and the bedding pulled down. 
 
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 Near the body, investigators found personal items placed on a chair, including an iPad and two different kinds of anti-depressants: Mirtazapene and Seroquel. Police found an engraved pocketknife with a dried red substance that was later confirmed as Williams' blood. Susan told investigators Williams often received gifts from his USO tours with the military, and that the knife was likely from her husband's collection. 
 
 A pair of black sneakers were next to the chair. In the right shoe was a pair of black socks; in the left, the assumed case of the pocketknife. Williams' iPhone and wallet were found in his pockets. 
 
 By the time police arrived, Williams was clearly dead, the report says. No efforts were made to revive him, and his death was declared at 12:02 p.m. 
 
 Despite a long and well-documented history of depression, Williams' wife and assistant said he never expressed suicidal thoughts or behavior. His pill dispenser had been refilled the day before, but the medications remained undisturbed in their appointed daily slots, Sunday through Saturday. The investigator asked Susan if Robin had ever mentioned suicide "as a solution to a significant health issue." After searching through Williams' iPad, which was near his body, Investigator D. Harris found only web browsers open to information about medications. A sweep of his iPhone revealed no texts or messages that indicated he was suicidal. 
 
 "There were no reflective devices or pornography near the body" the report says. The investigator says he "frankly asked" if Williams had any "history of autoerotic asphyxia. Mrs. Williams stated that he did not." However, one person interviewed said Williams had worked on a movie years earlier in which his character's son accidentally died by autoerotic asphyxiation. That person added that "the scene was very difficult and emotional for Williams" and he may have researched hanging during filming. 
 
 A search of Williams' iPhone, iPad and home computer revealed no search histories for suicide or hanging. However, the investigator writes that he later watched the movie in question — the dark comedy World's Greatest Dad — and said the character's son was found "seated on the floor, learning forward with a ligature around the neck secured by a belt" — very similar to the scene of Williams' death. 
 
 The Marin Sheriff's Office previously drew criticism for releasing candid details about Williams' death but said the disclosure was necessary under the California Public Records Act. The final autopsy report was originally scheduled to be released Sept. 30 but had been delayed twice. 
 
 Read more Robin Williams remembered by critics, close friends 
 
 Williams won the Oscar for best supporting actor for his performance as an avuncular psychologist in Good Will Hunting and earned four Academy Award nominations in a career that straddled film and television. His most recent TV show, The Crazy Ones with Sarah Michelle Gellar, was canceled after one season. 
 
 Email: Soo.Youn@THR.com 
 
 Twitter: @lalasoo 
 
 Oct. 7, 4:03 p.m. Updated with details throughout. ||||| Robin Williams Suicide Triggered by Depression, Parkinson's, Paranoia 
 
 Robin Williams -- Suicide Triggered by Depression, Parkinson's, Paranoia 
 
 EXCLUSIVE 
 
 was struggling with his Parkinson's, anxiety, depression and paranoia just before he committed suicide ... this according the Coroner's report.The paranoia has not been previously reported. According to the report -- obtained by TMZ -- the night before Robin died, he placed several wristwatches in a sock and gave them to someone because he was worried about their safe keeping.Williams had 4 drugs in his system -- 2 anti-depressants, 2 caffeine compounds, (listed as a drug). The Coroner's report confirms what we were told by various people ... Williams was sober at the time of death.When authorities found Robin's body ... they saw a closed bottle of Seroquel, a drug that treats schizophrenia, bipolar disorders and depression. It was prescribed a week before he died.The 63-year-old comedian committed suicide Aug. 11 by hanging himself with a belt in his Marin County home. He had also attempted to cut his wrists with a pocket knife. The report says authorities found a damp, white washcloth on the bathroom sink counter with a "reddish substance" -- possibly blood.According to the Coroner's report ... authorities asked Williams' wife if Robin was into autoerotica. She said he was not, but he worked on a movie several years ago in which the character who played Williams' son died of autoerotica, and the scene was "very difficult and emotional for Mr. Williams." 
 
 The report says the last outgoing call from Robin's phone was at 7:08 PM the night before he died. He had called his wife, and it lasted 38 seconds. She told authorities he called because he was picking up magazines for her at a bookstore.The night before he died, Robin's wife said he seemed ok ... he had been rummaging through their closet and grabbed his iPad, which she thought was a good sign because he hadn't even watched TV or read anything in approximately 6 months ... which presumably is a manifestation of depression.As for what Robin was looking at on his iPad ... the web browser had several tabs open to websites discussing medications, including Lyrica -- a seizure Rx -- and propranolol -- which treats blood pressure and tremors.She says the last time she saw him -- at around 10:30 PM Sunday, she described his demeanor as "excited."As for why Robin and his wife were in separate bedrooms, she told authorities he had been having trouble sleeping and would move around a lot in bed and talk loudly in his sleep.As we reported ... Williams was getting treatment for severe depression shortly before his death. After he died, Robin's widow Susan Schneider revealed he was in the early stages of Parkinson's According to the report ... Williams had experienced Parkinson's symptoms since 2011 -- he had a tremor in his left arm and movement in his left hand had slowed. He had recently started taking levodopa to treat it.Williams' wife wanted to see the body before it was removed from the house. They pulled back the sheets and she prayed over the body ... and Sheriff's deputies joined her. ||||| Story highlights Autopsy reveals no alcohol or illegal drugs in Robin Williams' suicide 
 
 Actor and comedian died August 11 at age 63 
 
 Williams was struggling with depression, anxiety, early Parkinson's, widow says 
 
 Beloved performer was mourned deeply after death 
 
 The death of actor and comedian Robin Williams has officially been ruled a suicide, the coroner in Marin County, California, said Friday. 
 
 Alcohol and illegal drugs were not involved, the statement from the coroner's office said. Prescription drugs were found in "therapeutic concentrations," the statement added. 
 
 Williams was found dead in his Tiburon, California, home August 11 from what investigators suspected was a suicide by hanging. He was 63 years old. 
 
 The death certificate, obtained by CNN on August 21, says his ashes were scattered off the coast one day later. 
 
 Investigators believe Williams used a belt to hang himself from a bedroom door, Marin County Assistant Deputy Chief Coroner Lt. Keith Boyd said at the time. 
 
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 Williams was sober but struggling with depression, anxiety and the early stages of Parkinson's disease when he died, his widow, Susan Schneider, said in a statement in August. 
 
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 "Robin spent so much of his life helping others," she said. Whether he was entertaining millions on stage, film or television, our troops on the front lines, or comforting a sick child -- Robin wanted us to laugh and to feel less afraid." 
 
 Williams had "a recent increase in paranoia" and was sleeping in a stepson's bedroom because of insomnia and anxiety associated with Parkinson's, according to the coroner's report. 
 
 A pathology report released Friday said Williams was diagnosed with Parkinson's disease in November 2013, several years after he first noticed symptoms such as tremors in his left arm and a slowing of his left-hand movements. 
 
 Last call made to wife 
 
 The coroner's report said his body was found about 11:45 a.m. by a personal assistant, who used a paperclip to open the locked door of the bedroom where Williams had been sleeping. Williams was found in a seated position on the floor of the bedroom with a belt secured around his neck and the other end of the belt wedged between a closet door and door frame. 
 
 The actor was wearing black jeans and a black short-sleeve T-shirt, the coroner's report said. 
 
 A cellphone recovered from Williams' pants pocket was dead. After recharging the phone, the coroner searched through its texts and emails and found no messages referencing suicide, the report said. The last call on the phone was made the night before to Williams' wife, Susan, and lasted 38 seconds. 
 
 In one incident the evening before he died, Williams took several wristwatches and put them into a sock and took them to someone's house for safekeeping, an indication of his paranoia, his wife suggested. Also noteworthy, according to Williams' wife, is that he may have learned of the suicide technique from a movie role in which a character Williams portrayed died from autoerotic asphyxiation. 
 
 Grief and remembrance 
 
 Williams' death was met with an outpouring of grief and recollections. Friend Billy Crystal paid tribute to him at the Emmy Awards, and later helped Williams' son, Zak, throw out the first pitch before Game 5 of the World Series while Williams' other children watched. Daughter Zelda got a tattoo in honor of her father. 
 
 Gilbert Gottfried, another friend, remembered a "generous" man who was welcoming to his fellow comedians. 
 
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 "To see Robin perform was an experience. He was more than a comedian. He was a comedy force of nature," he wrote on CNN.com. 
 
 Ellen DeGeneres, Jimmy Fallon, Conan O'Brien and David Letterman, among others, also paid tribute to the comedian. 
 
 David Letterman pays tribute to Robin Williams 
 
 Oscar-winning performer 
 
 Williams' long career was notable for his manic, improvisational comedy and his deeply felt acting performances. He won an Oscar for playing a therapist in the 1997 film "Good Will Hunting." A number of his other films, including "Mrs. Doubtfire" and "Patch Adams," were huge box-office hits. 
 
 He was also active in a number of charitable causes and frequently took part in USO tours. 
 
 Robin Williams: Full of demons, full of heart 
 
 On her Twitter feed, his daughter Zelda remembered her dad with a quote from Antoine De Saint-Exupery's "The Little Prince." 
 
 "In one of the stars I shall be living. In one of them I shall be laughing. And so it will be as if all the stars were laughing, when you look at the sky at night. ... You -- only you -- will have stars that can laugh." 
 
 Complete coverage on Robin Williams
– The coroner in Marin County, Calif., today confirmed that Robin Williams' death was indeed caused by suicide, reports CNN. The 63-year-old had no alcohol in his system when he hanged himself at his home, and the only drugs found were from prescribed medication in "therapeutic concentrations." The coroner lists caffeine, antidepressants, and the Parkinson's drug levodopa. That meshes with reports that Williams had been struggling with anxiety and a recent diagnosis of Parkinson's before his death. The coroner's report also reveals this odd anecdote, as relayed by the Hollywood Reporter: The night before he died, Williams put several wristwatches in a sock and gave them to somebody because he was worried about their safekeeping. TMZ sees that as a sign of paranoia.