The singer and former star of The Partridge Family was recently diagnosed with the memory loss syndrome, ET can confirm.
Cassidy recently spoke about his history with dementia -- including watching both his grandfather and his mother, actress Evelyn Ward, suffer from the illness -- and admitted to People that he had long feared that he would also receive the diagnosis.
"I was in denial," the 66-year-old "I Think I Love You" singer shared, "but a part of me always knew this was coming."
Cassidy also reflected on watching his mother "disappear" into her struggle with the disease, recounting, "In the end, the only way I knew she recognized me is with one single tear that would drop from her eye every time I walked into the room."
"I feared I would end up that way," he added.
Ward died in December 2012 from Alzheimer's-related dementia at the age of 89.
"I could've fallen off the front of the stage because I couldn't see," said Cassidy, who's had five eye surgeries over the last few decades and told the audience member that he was "highly sensitive" to bright lights. "I got to a point where I was really angry." Check out the video below to hear more about the incident.