Death: an unfortunate, inescapable part of life, and it'll eventually come for everyone - even the famous. So, when actors in the middle of filming a hit TV series pass away, the cast, crew, and even audience are frequently left with friend-shaped hole in their hearts. But the show must go on, right? Here are some of TV's most memorable characters who were written off after the actors playing them passed away. Beware of spoilers, and probably a couple of tears...