death/stopping of the clock!

My step father was in hospital, old and ill and not expected to live much longer. We went to see him in the evening and he saw and spoke to his daughter who had flown in from abroad to be with him. His only words to her were, "Now I've seen you I can go!" We left the hospital early evening and I asked the staff to contact me during the night should there be any changes. In the early hours of the morning I received a call. He had just died. I looked at the clock. It was 4.20am. Not wishing to disturb my mother or sister I went back to sleep. The next morning I went round to their house and broke the news. They asked what time he had died. I told them. At that information they both looked astonished and pointed to the battery operated wall clock. It had stopped at 4.20 am!