Derek Morgan:  What 'd you find , Reid ?
Dr. Spencer Reid: I went back ten years , matching reports of missing children with Daniel and Tyler 's victimology , and in my estimation , this UnSub may have taken 12 victims .
David Rossi: How can you attribute all of those to the same offender ?
Dr. Spencer Reid: The dates and locations of the abductions create an unmistakable pattern .
Emily Prentiss: Now , if he 's been abducting children for ten years , why were n't we called in before now ?
Dr. Spencer Reid: The thing is , he walks the entire trail , end to end , and each way takes approximately six months . His sixth victim was taken from Dawsonville , Georgia , in 2006 . Then he walked all the way to Manchester , Vermont , and he took a seventh victim in 2007 . He was n't down south again until _ 2009 _ , when James Clutter 's parents woke up from a night of camping , he was gone . They just assumed he wandered off .
Aaron 'Hotch' Hotchner: We did n't get called in because nobody knew he existed . The crimes are years apart and across state lines .
Dr. Spencer Reid: The interesting thing is , ten years ago he was a more aggressive hunter , likely on the move hunting and killing all 365 days a year , but two years ago he stopped travelling so far .
Emily Prentiss: He 's slowing down .
Dr. Spencer Reid: I think something 's affected his mobility , or old age , or an injury from years of living on the trail . But the odd thing is , for the past two winters , he 's returned to this 30 mile radius . He takes a victim with him in the fall to stay with him until spring somewhere within that area .
David Rossi: These are harsh winters . He needs to find shelter .
Derek Morgan: And it would have to be heavily camouflaged . Even the most experienced hikers haven't seen it .