On January 22, 1957, the Grimes sisters were found dead by a construction worker named Leonard Prescott. Their naked bodies were discarded next to the German Church Road near Willow Springs. Barbara Grimes lay on her left side with her legs slightly drawn up toward her body. Patricia Grimes covered the head of her sister. She lay on her back and her head was turned sharply to the right.
The autopsy, performed by experienced pathologists, earned much criticism and came to the conclusion that the Grimes sisters died on December 28, the day they vanished, and that they died because of shock and exposure to low temperatures. This cause of death was only determined by excluding all other possibilities. However, Harry Glos, one of the chief investigators in the case, believed that the Grimes sisters were still alive when their bodies were discarded next to the German Church Road. He concluded this because of a thin ice layer on the bodies of the girls, which indicated that their bodies must still have been warm when they were dumped there. Only after January 7, 1957, would there have been enough snowfall to create the ice layer. Therefore, according to this theory, the Grimes sisters must have been still alive until at least January 7.