Albert Einstein's;

E = mc^2

shows conversation of mass - energy

relationship. All living materials become non-living after a course of the time. Every non-living material have a well defined half-life period and ultimately meet to its death. Energy , e.g. heat travel without any medium and get lost its temperature effects after some time. Which might be considered to its death. Now the wave energy e.g. sound, light etc also get absorbed by some medium and results in its death. Black-hole is a place of ultimate gravity in the universe. All stars, galaxy's etc might get absorbed by black-hole's to meet there's death. This universe chiefly consists of mass, energy (light, sound, electromagnetic, infrared etc radiation waves) black- hole's and the space occupied by these features within universe. So, everything in the universe is convertible to its death. The space/volume of the universe is continuously expending, and is categorised as eternal identity. Nothing is stable in this universe. Deaths or conversations remain ultimate truth.