demise

the end of something that was previously considered to be powerful, such as a business, industry, or system:

The demise of the company was sudden and unexpected.

the death of a person:

Much has been written about the circumstances surrounding her demise.

My visits to his house continued until his sad demise at 86.

She blamed herself for his tragic demise.

My demise is not something I care to dwell on.

We were all stunned by his sudden demise.

the end of the operation or existence of something:

Huge corporate farms have led to the demise of many small, family-owned farms.