[ Rapture crosses her arms and shrugs, still sticking to her usual explanation. It seems to make the most sense to her. ]

Think about the information cards. Her role was a banshee that detects supernatural deaths.

Even if her killer doesn't intent to kill again, it doesn't mean there's no point to taking out someone that could pose as a future problem in the first place. Especially because there are plenty others here with "supernatural" powers listed on their cards.