Shows like Walking Dead, Breaking Bad and Game Of Thrones love to kill off characters, but when a supporting character is killed on a sitcom like Seinfeld or The Big Bang Theory people start to wonder why.
George's fiancee Susan was killed off because actress Heidi Swedberg lacked the comedy chops to keep up with the Seinfeld cast, so she didn't make the cut.
But sadly Howard Wolowitz's mom on The Big Bang Theory, who was never actually seen on camera, was killed off because actress Carol Ann Susi died of cancer.
Carol had previously appeared on Seinfeld as the unemployment office worker's daughter, Carrie, with whom George went out on a few dates to avoid losing his benefits.
This video by Looper reveals the real reason 10 different characters were written off popular TV shows, including the tragic tale of Tuco Salamanca the tired, and you can read a few more entries they left out of the video here.