In a Twitter video on Sunday, the comedian announced he’s now focusing on writing and acting.

I said, ‘You know, I’m at the top of my game.

After 50 years, almost, I’m gonna just call it quits.’

CURB YOUR ENTHUSIASM, Richard Lewis

Richard Lewis.Credit: Doug Hyun/HBO/Courtesy Everett Collection

And I felt great about that.

And then, out of the blue, the s— hit the fan.

“On top of all of that, two years ago I started walking a little stiffly.

I was shuffling my feet.

I went to a neurologist and they gave me a brain scan.

And I was diagnosed with Parkinson’s Disease.”

“I’m just focusing on writing and acting.

I have Parkinson’s Disease but I’m under a doctor’s care,” he explained.

HBO has not yet released a premiere date for season 12 ofCurb Your Enthusiasm.