Because you're actually kind of pretty and your daddy had no right to beat you like he did. But I don't have the time. I'm probably doing you a favor. Her neck snaps easily. The money, come to think of it, would be helpful, but there's no time now.
Police are already on the way.
I shoot the girl in the face, wander over to the rapidly cooling, stinking corpse in the living room, drop the shotgun, the gloves and the note, and close the door behind me. By the time I reach the car, the windows are completely defrosted. I quickly strip off my latex gloves and pull away as the apartment erupts into flames. Fast, chemical flame. Given the proper fuel, a fire will double in size every 30 seconds.