I have some ideas but, when I think about them they only make sense for Humans. This may actually make sense since the point of death would likely be different among species (plant, animal, protist, etc.). Also, I would argue that the actual life form never dies but in fact it is the personality or individuality that dies. Since reproduction is simply a form of continueing the original life. I would love to add more once I hear some responses seeing as how my thoughts most likely need revisions.
What do y'all think. When are we actually dead? As humans or if you think all life dies in the same way what makes something dead? Prefer to stay on humans though so that we don't stray too far off topic.