Heidi Swedberg as Susan Biddle Ross, Jason Alexander as George Costanza.
Gary Null—NBC/Getty Images
June 4, 2015 11:28 AM EDT

Jason Alexander apologized Thursday after a story he told about an actress on Seinfeld being “impossible” to work with went viral.

Alexander told Howard Stern Wednesday that Heidi Swedberg, who played his character George Costanza’s wife-to-be, was killed off in the show because the actors had trouble with comedic timing in their scenes with her.

But when the story went viral, Alexander took to Twitter to apologize.

The link goes to a post by Alexander that begins, “I feel officially awful.” He went on to explain that he and the cast always liked Swedberg personally and said, “She was generous and gracious and I am so mad at myself for retelling this story in any way that would diminish her.”

He finished the post with a direct appeal to Swedberg and to readers: “To Heidi, I personally apologize. You are a sweetheart. I actually launched into this on Stern to defend you. But this is why I’m not a lawyer. Now everybody, calm down and just enjoy the reruns and think, ‘why did he think this wasn’t working? This is great.'”

Write to Tessa Berenson at tessa.berenson@time.com.

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