and one which will ring a bell in many peoples' minds. It certainly does in mine because I've been involved in a similar incident. I was visiting a client at home once, and while I was parking the car I noticed a policewoman standing at the door of a nearby house. She was peering through the letterbox, and looking concerned, so I asked of I could help.
To cut a long story short, I helped her break open the door, and when we searched the house together we found a woman's body lying on the patio outside the back door. Her neighbour had not seen her for some time, and called the police, but she hadn't done so for five days - you can imagine the state of a body that had been outside for a few days in the summer.
We have probably all felt pangs of guilt at some point about not checking on older neighbours who live alone. Often we don't do it for fear of 'interfering' in other peoples' affairs, but perhaps we should worry less about that, and more about our neighbours, particularly in cold weather.