Susan Schneider Williams is working to reclaim her husband's legacy with the new documentary "Robin's Wish".<br />The project is designed to celebrate Robin Williams's life while explaining the undiagnosed illness that resulted in his death.<br />Williams died by suicide in 2014 at the age of 63.<br />The cause of his death was traced to Lewy body dementia, a rare, degenerative neurological disorder.<br />According to CNN, the documentary is a deeply personal look back at Williams' final days, through the eyes of family and friends.<br />"Robin's Wish" is available on-demand beginning Sept. 1.