After confirming the cause of death of the actor-comedian Robin Williams which is suicide, CNN said that Peter Pan actor was on the early stages of Parkinson Disease, and his wife admitted it last Thursday.

On Monday, the actor was found dead and investigator suspected it was a suicide as Williams was hanging.

Many fans, close friends, and families are wondering why 63-year old comedy icon took away his life. His wife Susan issued a written statement about his husband's health that he had kept a secret.

"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."

It is not yet clear if Parkinson diesease affects his ability to work. The National Parkinson Foundation shared their knowledge about this illness, saying:

"Friends and family can usually detect changes in the Parkinson's patient including poor posture, loss of balance, and abnormal facial expressions,"

"During this initial phase of the disease, a patient usually experiences mild symptoms. These symptoms may inconvenience the day-to-day tasks the patient would otherwise complete with ease. Typically these symptoms will include the presence of tremors or experiencing shaking in one of the limbs." they added.