Trivia: Larry Hagman ("JR") was the only actor to appear in all 357 episodes of the show.
Trivia: The "Who Shot J.R.?" shtick was so secretive that even the actors didn't know the answer.
Trivia: Even though Barbara Bel Geddes played Larry Hagman's mother in the series, she was only 9 years older than him.
Answer: In real life, that might happen, but this is a fictional TV show that revolves around the characters and the dynamic interaction between them. Getting rid of JR, a main character that much of the story line revolves around, would make the show far less interesting, less melodramatic, and less intriguing. It's just an entertaining, over-the-top exaggerated soap opera.
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