Have you not talked to Dieonarra in the Mortuary. Talking to her enables an ability to Raise Dead characters through TNO.
If you cant find your way back (by the way you need to get the guy outside to kill you to get back into the Mortuary), you'll have to go to a Priest. Off the top of my head, i cant think of one except for the man in the Dustman Bar in the NE section of the Hive.
"Welcome, Stranger" : "What are ya buyin?" : "Come back anytime..." -- The Merchant, RE4