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A lot of fans who see this are straight away going to think I’m crazy for saying this but even though Kate Beckett is a major character in Castle and the main premise to this show is solving Kate's mothers murder, but Kate Beckett could still be killed off and here are some of the reasons I believe the show could go in that direction.
First off the very obvious one which is, powerful people want to kill Kate and they’re really not happy about the fact that she has survived this long, Kate's a fighter that’s for sure but there’s only so many times you can spit in the devils face before the devil spits back. Even with all of Kate's smarts and instinct she is no match for the trained killers that come after her, which is proven when she goes head to head with the guy who shot her and comes very close to getting killed but she is saved at the last second.
The point I’m making bringing that up is that if Kate was ever truly alone with no help coming she would lose. Now even though the show revolves so much around Kate the thing is even if she was to die the show could still continue, because Castle would still be alive he would put his everything into finding the people who killed the woman he loves and while taking the burden of also solving Kate's mothers murder.
Kate calls Castle her "plucky sidekick" when in truth it’s actually her. Castle is the hero of this story even though it may not seem it. For four seasons we watched as Castle and Kate danced around their love for each other until finally in the last episode of season four they finally got together. In doing that the show no longer needs to keep Kate in the picture we finally have them together so that some might consider the suspense is now gone because that moment we have been waiting for has happened. Theoretically they could now kill Kate because the fans won’t be going crazy about it saying “Oh no you can’t do that, Castle and Kate never even got to be with each other.”
Fans would obviously be really upset but it wouldn’t be as bad now and if done right it would be really hard hitting and sad it would make you want to keep watching even though Kate's gone just because you want to see what Castle is going to do now and see how he’s going to overcome the pain and loss.
It would also be a very shocking twist which the show has done before when they killed off Captain Montgomery while also revealing him to be the third cop. It was surprising and sad but at the same time it all worked perfectly. So the people behind the show can pull something like this off and really make it work.
Now the final reason they could kill off Kate Beckett. The show is called Castle since the very beginning Castle is the main focus the one we really want to watch the one we really want to know, we know nearly everything about Kate but with Castle there is still so much we can find out. What makes him so interested in murder? Who is his father? We don’t even know Castles exact age when you think about it.
Castle has proven he can solve murders without Kate's help and he has spent a lot of time looking into Kate's mothers murder. He has shown he is a pretty decent marksman and in his own way isn’t that bad of a fighter either. Also like Kate he has a real never give up attitude so there’s no real issue of him not being able to take care of himself he isn’t just a writer even though that’s what everyone thinks when they see him. This is why I believe the show could kill off Kate Beckett.