The Little Lamb Killer: Equestrian Killing

A mysterious killer's is prowling Manehattan, this is what happened to me... before he killed me.

What? Why? Who? And How?
These are the four questions constantly asked about this creature that have yet to be answered. A creature that only leave death in its passing. Those near by claim to hear a young boy's voice sing around the time of the killing, and they are right as he did sing... before killing me.