The late Robin Williams had been battling the early stages of Parkinson's Disease before his tragic death on Monday, as his wife Susan Schneider reveals.

Schneider issued a statement on Thursday, claiming that the late "Awakenings" actor, whose body was found with a belt wrapped around his neck and cuts on his wrist, was suffering from something more than depression and anxiety.

"Robin spent so much of his life helping others. Whether he was entertaining millions on stage, film or television, our troops on the frontlines, or comforting a sick child -- Robin wanted us to laugh and to feel less afraid," the statement read.

"Since his passing, all of us who loved Robin have found some solace in the tremendous outpouring of affection and admiration for him from the millions of people whose lives he touched. His greatest legacy, besides his three children, is the joy and happiness he offered to others, particularly to those fighting personal battles.

"Robin's sobriety was intact and he was brave as he struggled with his own battles of depression, anxiety as well as early stages of Parkinson's Disease, which he was not yet ready to share publicly.

"It is our hope in the wake of Robin's tragic passing, that others will find the strength to seek the care and support they need to treat whatever battles they are facing so they may feel less afraid."

After Susan Schneider's heartbreaking statement was released, Williams' friend and fellow actor Michael J. Fox was shocked to discover the late "Mrs. Doubtfire" actor's diagnosis.

"Stunned to learn Robin had PD. Pretty sure his support for our Fdn predated his diagnosis. A true friend; I wish him peace," he tweeted to his 1.16 million followers.

The "Back to the Future" star was diagnosed with the illness back in 1991 and has been influential in bringing awareness to the incurable disease with the Michael J. Fox Foundation for Parkinson's Research worldwide.

"Famously kind, ferociously funny, a genius and a gentle soul. What a loss #RobinWilliams," Fox previously tweeted.