I'm assuming a killer tried to do kill someone. Of course, they could choose not to kill, but I find that unlikely. If the narrative is accurate, that means the killer would've been mentioned at some point in the narrative.

You're candy girl, who tried to sweeten the pot. If we believe you, then you're not the killer.
Intimidating Sword Guy used a mass-roleblock. He can't be the killer.
The adult walking in the halls? Not sure what he did. He could've been the killer until he got blocked.
The creepy person in the room? Sounds dangerous, that's for sure.

Of course, this all assumes that a Town roleblocker can block night kills like a doctor can. I have literally no experience with Town blockers. This is just one theory, and to be honest it does assume quite a lot. I mean, people can not be the killer, but still be witch-aligned, for example.