11. Tracy McConnell - How I Met Your Mother
To start us off, here's an example of a character who shouldn't have been killed in the first place. Sure, The Mother died at the very end of How I Met Your Mother, but her death remains one of the lowest low points of the otherwise brilliant sit-com.
Now, a case can be made for Tracy's death, as it can be seen as the show proving yet again just how unpredictable and cruel life can be. But that's about all it has going for it.
Tracy McConnell's death was a biblical let-down to say the least. After nine long seasons, having her die just so Ted can go rushing out to see Robin again defeated everything fans had watched since the very first episode. On top of that, we never get to see her, really; she doesn't get time to massively stand-out or interact with the gang.
Rather than spending Season Nine focusing on Barney and Robin's anti-climatic wedding, more time could have been spent looking at Tracy as a member of the group, a loving mother and a great wife.
Alas, no. Not only don't we get this, she also dies and gives way to the most divisive show ending since Lost. It shouldn't have been allowed to happen, and the show suffered because of it.