Her name was Miki, and she was your girlfriend a long time ago. But something had happened, an argument, and you said some things that made her mad. She overreacted and without thinking grabbed a kitchen knife and stabbed you. She did realize what she did and tried to stop the bleeding but she couldn't save you in time. In a fit of rage she went to kill someone else. She was now a serial killer... and for some reason she started to see you.

one day (about six months after your death) Miki was in an abandoned warehouse cleaning off her weapons after killing about a dozen people. Suddenly Miki hear your voice "Niki, po" only you have ever called her that. Niki freezes in place and after a long while she hesitatingly turns around and sees... you

What the? No, This must be my mind playing tricks again.