FTA: “When is exactly the time when we die? We may have tapped the door open now to start a discussion about that exact time onset”

They must not have been paying attention during their studies. That discussion has certainly been going on ever since we managed to restart a human’s heartbeat. Philosophers likely have discussed it for centuries, if not millennia, before that.

Modern medicine definitely doesn’t use “has no heartbeat == is dead”. https://en.wikipedia.org/wiki/Legal_death#Medical_declaratio... adds “irreversible” to the definition:

“Two categories of legal death are death determined by irreversible cessation of heartbeat (cardiopulmonary death), and death determined by irreversible cessation of functions of the brain (brain death)”

(And, of course, “irreversible” changes as science progresses)