Hike around the back (non road-side side) of Big Bend Butte (go left around the Butte). Hike along the back side of the Butte to its southern (I think) end. Look for the greatest weakness up the walls in this area. Grim Reaper starts up a left facing corner (there used to be a fixed pin on the first pitch), then continues up the chimney system above. The first pitch is the crux. There is considerable stemming.
