Both the Canadian Cannibal, taken into custody in Berlin, Germany...and the Baltimore Cannibal, in custody in Baltimore...have a commonality as both had a deep fascination with the internet...and have delivered a plethora of postings, the reading of which would lead most people to think the writers were not quite right.

Both cases involve dismemberment of their victims and the eating of human flesh. 

The flood of internet writings may suggest schizophrenia...since one of the signs of that disorder is a compulsion to write at length about things folks considered normal don't approach in such detail, or, with such urgency.

This article discusses the " new " effort to understand and gather evidence re perpetrators via their trail on the net.