This was very well written! I liked the rhythm of it, and I liked some of the devices you used to convey your message.
My main recommendation would be perhaps going back through and switching up some word order or choice to make the rhythm and meter more smooth and consistent. A couple of examples/suggestions are changing "There once was a murder" for "Once there was a murder", and "Just like most murders" for something like "Just as in most murders" or "Like any other murder".
All in all, great work! I hope that you didn't draw too much from personal experience to write this.

You did really well on this, cannot wait to see more of your work.