I think that they would define death as unable to self-sustain life without machine support and lacking in brain activity.
Woman wakes up right before organ removal.
https://abcnews.go.com/Health/patient-wakes-doctors-remove-organs/story?id=19609438
Scary.
“The patient did not suffer a cardiopulmonary arrest (as documented) and did not have irreversible brain damage,” the HHS report concluded. “The patient did not meet criteria for withdrawal of care.”