User blog comment:Fusedtwilight/The New Death/@comment-79.115.77.203-20160218214104/@comment-24.118.108.237-20160219002806

If I'm not mistaken Death recieves his power through his ring (Dean technically had Death-tier abilities when wearing it). The show is very unclear as to how Death operates, but we can assume that, if no new Death came into being, another Reaper picked up the ring and assumed the position.