Actor Robin Williams was experiencing the early symptoms of Parkinson's disease before he committed suicide on Monday, according to news reports.
In a statement, Williams' widow, Susan Schneider, said that her late husband had been struggling with the early stages of Parkinson's disease, but was not ready to share his diagnosis with the public, according to USA Today.
"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," Schneider's statement said.
"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," the statement said.
Parkinson's disease causes the loss of brain cells in a part of the brain that controls muscle movement. Symptoms can include tremors, stiffness in the arms and legs, and impaired balance and coordination, according to the National Institutes of Health. [3 Myths About Parkinson's Disease]