I don't think they found just hair and just to be clear in case it is not I think he is guilty as the day is long. I just think you can't assume what they did or didn't find based on the agg. kidnapping charge b/c i think missing month later and proof she was in the car is likely good enough to get a warrant.
I wonder how they determine AG or murder charges? I would think if they found her blood he would be charged with murder. Otherwise, AG is the next best charge, say if they found a hair.