When a character suddenly dies on your favorite TV show, you go through the usual stages of grief: shock, sadness, hoping it's a dream sequence, Facebook petition, reruns, Twitter rant, and, finally, acceptance. Questions arise when a fan-favorite is suddenly cut from the story line. Is it just for ratings, or is there a bigger behind-the-scenes drama going on? Here are 12 TV stars who were killed off for reasons that may surprise you. 

1. Susan on Seinfeld

Heidi Swedberg played George Costanza's fiancée Susan. She was killed off for apparently "lacking chemistry" with Jason Alexander. Susan died doing what she loved: licking poisonous glue on envelopes of wedding invitations.