The living dead are corpses resurrected by black magic. Unlike the Inferi, no one can kill them except dementors and makers after resurrection. The condition of death is the loss of the soul.
However, people only saw the endless life of the living dead, but almost no one noticed that the life that was extended indefinitely and pressed the stop button was actually more miserable than anyone else. There is no way to die, and even if you die, there is no so-called peace after death.
The death of the living dead is just a person walking alone on the street without lights in the silent night of sleep, but it will never reach the end.