When is it morally acceptable to let someone that is severely impaired to die?

Determining when it is morally acceptable to let someone who is severely impaired die involves complex ethical considerations. It may be considered acceptable when the individual is experiencing unbearable suffering with no hope of recovery, and when their quality of life is deemed irreversibly diminished. Additionally, respecting the person's autonomy and previously expressed wishes, if they exist, plays a crucial role in this decision. Ultimately, such choices should involve careful deliberation among medical professionals, ethicists, and family members.