A hit-man's killer

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My work is slightly different to your, or at least I hope. See my job is what some people my call, braking the law or just down right illegal. I am a hit-man.
Oh sorry hit-woman. My code name is star as I alway work at night. The people that hire me have never seen my face and never will, well that's what I was led to believe.
So far (since I am a new recruit) I have only killed about 150 people, the only problem with my job: besides the nightmares, is the loneliness. My best friend Sam used to be my second in command on my daily routines till one day it all went wrong...

My job is normal pretty simple get a name a face and where they are going to be at 9, the only time I will ever kill, and the weapon of the person who hires me choice. Me favourite is a time of knife that way you choose how painful and it's silent. Sam was one of our best killers, had been in the game for a while and was lethal with a bow and arrow. Only one arrow needed. I could never be that good they did try me on it for a few days. Yeah you can see where that got me.

It was my assignment time. Every Friday we meet  in an abandoned old work house that used to make swords which makes it handy for our line of business. Today I wore my personal favourite clothes for this occasion, black hoody with a blood red mask. As I said no one knows who I am...

My mission this time is pretty simple. Someone wanted his boss dead, told me where he would be, then of course payed me £500. Yeah my work isn't cheap, plus emotional damage. This guy was you common Joe. Works at a post office and pissed of some guy, next thing you know I'm going to kill him...

9 o'clock. Let's do this...
Oh crap! I'm going to kill whoever payed me to do this, and when I say that I mean literally. This guy has a dog. Not only that was walking it, it's not like I can go to his house and give the dog to his wife (well widow now). Guess I have a dog now? Oh well.