Aaron Hotchner:  Have you nailed down the victimology ?
Dr. Spencer Reid: You know , I found a unique evolution , actually . The earliest victims appear to be high - risk . These lesions are consistent with syphilis , most likely a prostitute . This one has severely ground and missing teeth , commonly seen in excessive methamphetamine abuse . And then all of a sudden out of nowhere , a sea change - healthier and stronger victims all the way through to number twelve .
Aaron Hotchner: Lower - risk , harder for him to hunt . What do we know about the first victim ?
Dr. Spencer Reid: You know , that _ one _ 's tough . He or she has been in the water so long , they 're mostly bone fragments . I can attempt to reconstruct ...
Aaron Hotchner: You 've got three hours .
Dr. Spencer Reid: I can do it in two .
Aaron Hotchner: Make it one .