World Of Warcraft: Retrieving Your Corpse in Naxxramas

If you die in Naxxramas you will need to run northwest from the graveyard to a large structure that contains a portal pad. This would be the normal entry into Naxxramas if attuned, and will teleport you as a ghost into Naxxramas which should resurrect you once on the other side. The NPC in Light's Hope Chapel must still be used for normal entry on the PTR.

Please be aware that there is currently no way to exit Naxxramas short of a mage portal, hearthstone, or death.