Dr. Karen Fletcher (Split)
Even though Kevin Wendell Crumb (as The Beast) ends up killing her, Dr. Fletcher makes the list because she was so invested in her patient that she to go to his lair in hopes that she could figure out what was going on with him. Unfortunately for her, this was a stupid move and she should’ve at least had some police wait outside, but she didn’t want to destroy his trust in her. She died for her cause, and she left a note for Casey with instructions to say Kevin’s full name, which helped buy Casey time.