Why did Kramer leave Seinfeld? The confusion traces back to one night in 2006
Here's the thing about this question: it contains a false premise, and untangling it explains why so many people ask it.
Michael Richards never left Seinfeld. He played Cosmo Kramer in all nine seasons, from 1989 through the finale on May 14, 1998, winning three Emmys for Outstanding Supporting Actor along the way. Nobody wrote him out. Nobody replaced him.
So why did Seinfeld end?
Because Jerry Seinfeld ended it. NBC reportedly offered him $5 million per episode to make a tenth season, and he turned it down, preferring to go out on top. The finale aired to an audience of 76 million people. Kramer was there for all of it — hoarding the laughs right through the final courtroom scene.
Then where does the confusion come from?
One night: November 17, 2006. Richards was doing a stand-up set at the Laugh Factory in Los Angeles when, responding to hecklers, he launched into a tirade that included repeated racial slurs. An audience member filmed it, the video spread everywhere, and it became one of the defining celebrity stories of that decade.
Richards apologized days later via satellite on the Late Show with David Letterman, in an appearance arranged by Jerry Seinfeld, and soon retired from stand-up entirely.
He then largely vanished from public life for nearly two decades — and that long absence is what fused, in a lot of memories, into a vague idea that "Kramer left the show." He didn't. The show had already been finished for eight years when the Laugh Factory happened.
Did he ever work again?
Some. He appeared as himself in the 2009 Seinfeld reunion arc on Curb Your Enthusiasm, alongside the full original cast, and took a role in the 2019 sitcom Kirstie. In 2024 he published a memoir, Entrances and Exits — with a foreword written by Jerry Seinfeld — covering his life, the creation of Kramer, and that night in detail. In it, he addressed his long disappearance directly:
"I took myself out," Richards wrote in Entrances and Exits (2024).
He told People the same year, "I'm not looking for a comeback. " The book also revealed he'd quietly survived stage 1 prostate cancer. In September 2025, at age 76, he returned to a comedy stage for the first time in almost 20 years.