there is a long tradition of deathbed photography because before "travel" became easy,
it was very difficult for people from "out of town" to visit their loved ones-attend the funeral.
i have been interested in this sort of photography for a long time, never having taken any deathbed photos personally ...

if you haven't seen it, the film "photographing fairies" has to do with post death photography, not deathbed, but combination work.