Williams was found dead on August 11 after he took his own life.
His publicist confirmed that he had been suffering from "severe depression" after he was admitted to a rehabilitation clinic a month previously to continue to "focus on his sobriety".
It later emerged he was also in the early stages of Parkinson's disease.
This week a fan of Williams, 21-year-old Vivian Waller, who is suffering from terminal cancer, shared a video message the comedian sent her to give her hope in her final months.
Speaking to Fairfax Media, Waller's husband, Jack, whom she married in February, told of her joy at receiving the message. "Viv struggles with a lack of energy and it's quite difficult for her to concentrate," he said. "We're just enjoying the time we have together."
However, he admitted he was yet to tell his wife Williams had taken his own life, adding that he'd decided to share the video because the family "love him, we want to show people how awesome a person he was".
- Independent