A century ago it was widely believed that the image of a killer was forever imprinted in the eyes of the victim. Sort of stamped on their retinas. This has been termed Optography and was a fiction staple in the 1800s and early 1900s. Of course, this isn’t the case. Not possible. Not yet, anyway but who knows what the future will hold.
However, in some situations a photo of the victim just might retain the killer’s image and this might be useful in tracking down the bad guy.