once you die, does everything? What is death? Is death what happens when your body leaves your soul if, for example, you were killed and thus your body stopped working? Or, is death the decay of everything you are composed of?
To use the former definition of death, and call yourself the last incarnation of death, is a fraudulent, or dishonest statement. Afterward, time will exist and will have factored into your death, but time will still exist with death.
To use the latter definition of death, one which I personally find more fitting, makes a much deeper statement about who you are. However, there remains no room for a final incarnation. All of energy itself, all of the universe, has a beginning and an end but until then it is shared throughout time. We might all be one single incarnation of death, but really what we are is a component coalescent with death, energy, and time, for which the universe was created.