User blog comment:Fusedtwilight/The New Death/@comment-6344309-20160522120952/@comment-1975828-20160522123703

"Death", as portrayed by Julian Richings, was the persofication of death. So long as there is life, there is death, and because life existed passed Death's demise, then a new death must come. I doubt it has anything to do with the "power from the destruction of the old Death", I just doubt it.

However, the absence of a new Death or the introduction of one may possibly be because the writers either 'forgot', or don't care about the Horsemen anymore. People still die, no need to show who represents that aspect, I guess.

Also, in my opinion, Billie is a replacement for Tessa, a somewhat friendly reaper ally of the Winchesters.