Robin Williams, who was found dead from an apparent suicide earlier this week, was battling the "early stages" of Parkinson’s disease at the time according to his wife Susan Schneider who issued a statement Thursday.

Schneider also said Williams' sobriety was intact 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."

Hailed as a comic genius, and a star of movies and television for more than three decades, Williams was known for being open about his problems with cocaine and alcohol over the years.

Schneider stated,“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.”

Parkinson’s disease is a disorder that causes dopamine-producing brain cells to die, and as a result, may gradually affects a person’s motor system, causing shaking, imbalance and trembling of a person’s limbs, according to the National Institute of Neurological Disorders and Strokes.