He offered to take her to her doctor’s appointment. She had been feeling sick for a few days now and they just needed to see if everything was alright. He took her to the waiting area and told her that he was quickly going to run some errands and that he would be back in an hour.
He waited for hours on end for his wife to come back, but she never did. The clues that led to the solution came from an old photograph and a new clue 42 years later.