Fellow Rehab Patient Says Robin Williams 'Weary' In His Final Days

According to a woman claiming to have recently been in rehab with Robin Williams, he was "in a terrible state." INSIDE EDITION has more.

Even though he was leading a tortured existence toward the end of his life, Robin Williams still devoted time to helping others.

Earlier this year, the Oscar-winning actor sent a personalized video to a cancer patient he had never even met.

Vivian Waller, who is terminally ill, drew up a bucket list, and one of her goals was to meet Robin Williams. Because she was too sick to travel from her home in New Zealand to California, Williams sent her a video message.

In the message, Williams said, "Hi Vivian, it's Robin Williams here saying, 'Knock this off your bucket list. I said, hey, hey, hey! What's going on? It's alright, alright, alright. I'm just channeling Matthew McConaughey. Much love to you, baby."

Unknown to the world, though, Williams reportedly complained he was "weary to his bones" in his final weeks.

A woman who says she was with the beloved actor at the Hazelden Addiction Treatment Center in Minnesota says Williams was "in a terrible state."

She quoted him as saying, "I sometimes feel I could fall asleep standing up."

"Even though he would goof around from time to time, just like he did on screen, there were many other occasions when his face reflected deep depression and unhappiness," Teresa Cohen told the Sunday Express in London.

"Tears ran down his cheeks when he told me his greatest fear was relapsing and drinking himself into an early grave while his family watched helplessly," said Cohen.

Cohen said she was at the renowned Hazelden Clinic in June when she encountered Williams.

Meanwhile, as Williams' loved ones prepared for his funeral, his friend, actor Rob Schneider, made a startling claim about the star's suicide.

Schneider tweeted, "#RobinWilliams was on a drug treating the symptoms of Parkinson's. One of the side-effects is suicide!"

Williams' widow revealed last week that he was in the early stages of Parkinson's disease.

INSIDE EDITION spoke to neurologist Dr. Robert Rodgers.

"Suicide is one of the possible side effects of any Parkinson's medications," said Dr. Rodgers. "It certainly would list very low down on a list of potential side effects."

Williams got a touching tribute from the Disney Channel. Weekend airings of Aladdin, the movie for which Williams provided the voice of the Genie, ended with a graphic reading, "In memory of Robin Williams, who made us laugh."