The Past You've Long Forgotten

Sinn is nowhere near my name but I was given it because that's what I was called, I don't even remember what my real name was.

"Another round!" a customer yelled at me as I was cleaning glasses. By day, I'm just a bartender but during the night I was a murderer. Of course, murder is wrong but honestly, some people do deserve it, well that's my mentality at least. While I was making the customer's drink I heard him talking to another person.

"Did you hear? The serial murderer has been attacking this area lately?" the man said to the other.

"What? But why?" 

"Does a mass murderer need a reason to murder?" 

"I heard every person he killed had at least committed an offence punishable by death but of course managed to get out," a woman chimed into the conversation. I know this woman, she's in the bar every night till closing and even then she'd stick around. She just so happens to be a cop I believe she's suspicious of me.

"So