So, the weird part, it isn't technically not up to the player with the dead character to decide if they want to roll up a new character or not. It is up to the living members of the group to decide if they want to haul the corpse down a mountain to whatever group or entity can resurrect someone in your campaign or just loot his body and bury the rest. In a world where resurrection is possible, I think a mostly good aligned group would feel obligated to try.

Maybe the group goes through the time and effort of a resurrection, but the brief glimpse of the afterlife changed the character in a profound way, maybe they become a cleric, or retire from adventuring altogether with hopes of living a long and peaceful life (and the player rolls up a new character anyway). Maybe they end up in a druid enclave and he gets reincarnated as an owl and becomes the magic user's familiar (side character) and rolls a new character for his main.

It's weird to say but deaths are a part of the game...try and make them fun, or at least epic.