The End

We join our seasoned detective as she surveys perhaps her last crime scene. She won’t be allowed to work on the case though, not because she retires in a week, but because of a conflict of interest; it’s her husband that’s dead. She still scans the room to see if there’s anything she’s missed - a force of habit really.
The room, their bedroom is naturally covered in her DNA. She removes the murder weapon and feigns sadness as she reports him dead; then closes the door with a relaxed sigh at the thought of a blissfully peaceful retirement without him.