Washington Nov 12: Robin Williams may have taken his own life but his suicide was driven by a disease called Lewy Body Dementia. According to the sources linked to his family and the actor's doctors the Williams was suffering from the horrible disease which was the 'key factor' that drove him to kill himself TMZ.com reported. (Read: How to overcome the stigma of dementia) Lewy Body Dementia is a condition closely associated with Parkinson's disease and the people who are troubled by both often face severe side effects from Parkinson's meds. The patients often hallucinate and even converse with the