The comedian and Oscar-winner took his own life on August 11th, 2014 and left behind a legacy that includes his daughter Zelda, sons Zach and Cody, and third wife Susan.
In a new interview with ABC News, the graphic designer - who was married to Williams from 2011 until his passing - describes what its like to live life after the suicide of a loved one and how Robin's state of mental health wasn't curable.
"I know we did everything we could… People have in passing will come… They would say to me, 'God, I wish I had done something more for him. If only I had called him.' And I'm thinking, 'No one could have done anything more for Robin.' I just want everyone to know that. Nobody — no one — everyone did the very best they could. This disease is like a sea monster with 50 tentacles of symptoms that show when they want. It's chemical warfare in the brain. And we can't find it until someone dies definitively. There is no cure."
Almost horrifically, Susan also details some of what has been said to her in passing over the last 14 and a half months and it sounds like a lot of "what ifs" and survivors guilt.
"No. Not even — no," she says when asked if the Mrs. Doubtfire star had ever hinted he didn't want to live any longer. "No. I mean, he was sick and tired of what was going on, absolutely… and when he got the Parkinson's diagnosis, you know, I mean, in one sense, it was like: This is it. This is what we've been — we've been chasing something, now we found it. And we felt the sense of release and relief. But also, like, ‘Oh, my God, what does this mean?'"