What would you do if the PC's went to the local temple with the body and wanted to pay to get the NPC resurrected?
Turn it into a adventure! The cost of the resurrection is as great or as little as I need it to be at the time(in gold). The important part would be the cost the pc's would pay towards the story!
So it might be as simple as a free resurrection from a grateful clergy for helping to promote the deity and or good will of the region or as steep as the soul can't be resurrected without journeying beyond Deaths Gates into the underworld and freeing him from(dun Dun DUN!) the Dungeons of Hades.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.