that's the "death rattle"
that's over by the time I'm there
"A death rattle is a gurgling or rattle-like noise produced shortly before or after death by the accumulation of excessive respiratory secretions in the throat.
Those who are dying may lose their ability to swallow, resulting in such an accumulation. While it is medically established that the death rattle is a strong indication that someone is near death, it can also be produced by other problems that cause interference with the swallowing reflex, for instance, brain injuries."