https://en.wikipedia.org/wiki/Joyce_Vincent
Joyce Carol Vincent (19 October 1965 – December 2003) was an English woman whose death went unnoticed for more than two years.
Neighbours had assumed the flat was unoccupied, and the odour of decomposing body tissue was attributed to nearby waste bins.
It was only after her bank accounts ran out of money that the landscaping stopped that her property became overgrown and the lights didn't come on every day because the electricity got shut off that someone asked "has anyone seen so-and-so lately?" and the local PD did a health & welfare check. They had to force their way into the home and found her mummified body in a rocking chair.
Wish I knew how to search & find that article. It was a fascinating read into how we all don't really pay attention to our neighbors anymore.