Simulated self-organisation of death by inherited mutations
  An agent-based computer simulation of death by inheritable mutations in a changing environment shows a maximal population, or avoids extinction, at so intermediate mutation rate of the individuals. Thus death seems needed to al for evolution of the fittest, as required by a changing environment. 
J.S. Sa Martins, D. Stauffer, P.M.C. de Oliveira, and S. Moss de   Oliveira