tycho, on Feb 20 2008, 19.01, said:
but not all of them who have been resurrected have come back alive ;) , like our good friend lady stoneheart. even if benjen isn't coldhands, coldhands is certianly a character who walks the line between true life and undying life fairly tightly.
I see what you're saying but I think Beric, Catelyn/Stoneheart and (in my theory) Benjen/Coldhands are really "alive" again and autonomous, unlike wights, when they are resurrected. Furthermore, we have ample evidence (especially with Beric) that resurrection does not erase all physical changes or damage to the body. Physical evidence of all the various ways in which Beric died was still present after each subsequent resurrection. The same goes for Catelyn/Stoneheart. Her throat was severely, deeply cut and she can now only manage a whisper. Also, she was in the river for a few days and now has pale, scaly skin or whatever. So the resurrection got her back to some semblance of "working order' but it didn't/couldn't heal everything.
My theory is that Benjen was killed somewhere beyond the Wall and, of course, a dead body would quickly begin to freeze and the extremities (hands, feet, etc.) would begin to freeze and turn black first. I think he was resurrected by the Three-Eyed Crow and/or the Children of the Forest and is now Coldhands.