We have proposed a theoretical hypothesis called the Programmed Self-Decomposition (PSD) model [1,2]. The PSD model assumes that a self-decomposition mechanism is programmed in each cell of all living organisms on earth, and that this mechanism contributes to the substantial and spatial restoration of the ecosystem. In this article, we would like to introduce the overview of the hypothesis and report on computer simulations is which both a mortal virtual life form based on the PSD model and an immortal virtual life form start their lives in the same finite, heterogeneous ecosystem. Results of the simulations suggest that the mortal life forms would not be exterminated in almost all cases, contrary to ordinary expectations. It seems that the effectiveness of "death" cannot be denied.
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