Suggestion: A stalker follows a woman into an independent business, and is suspected of the massacre in it, in which the woman is a victim.

https://www.imdb.com/title/tt0629386/

https://www.imdb.com/title/tt2296428/

In Law & Order "Pro Se", the stalker is schizophrenic and homeless, and the business is a vintage clothing store. He's indeed guilty, and his weapon was a bayonet he stole.

In CSI "Code Blue Plate Special", the stalker is obsessed with the woman and wants, and the business is a diner favored by police. He's not guilty, but he indeed put her in danger to be shot with the rest of the victims.

I don't know if it's true crime or fiction work. I don't even know where to start.