Turns out it wasn't just bad wedding invitations that killed Susan Ross. In fact, it was the actress' complete lack of comedic chemistry with the Seinfeld cast that led to the death of George Costanza's fiancé.

Jason Alexander revealed the details surrounding Susan's untimely demise during a visit to the Howard Stern Show on Wednesday. When Stern steered the topic toward rumors that Alexander couldn't stand actress Heidi Swedberg, the actor was quick to clarify: "She's a terrific girl...I couldn't figure out how to play off of her."

Alexander explained that though he often had trouble finding the right comedic tone with Swedberg, his cast mates were hard pressed to believe him. It wasn't until Jerry Seinfeld and Julia Louis-Dreyfus performed extensive material with Swedberg in Season 7 that they took Alexander's concerns seriously.

"Julia actually said, 'I know, don't you want to just kill her?,'" Alexander said, which he says gave show runner Larry David the perfect plot line for his then-undecided season finale. Cut to the end of Season 7 and poor Susan dies after licking poison envelope glue.

Harsh? Maybe, but don't worry too much about Swedberg — she's living the dream life of an accomplished ukulele teacher.

UPDATE, June 4, 10:56 A.M. ET: Alexander issued a response that further clarifies his comments on the Howard Stern Show.

He writes that no one on the cast disliked Swedberg, and that it was his intention to defend her from rumors when he told the story on Wednesday's show.

He also clarified that when comments were made about killing off Susan, they were directed strictly toward the character and not toward Swedberg herself, who Alexander writes, "was generous and gracious and I am so mad at myself for retelling this story in any way that would diminish her."

He closes out his statement with an apology: "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.'"

Hear Alexander's entire story in the clip below: