Heebe hired a forensic language expert who identified the online IDs as sockpuppets of the prosecutors.

FORBES: Federal Prosecutors Let It All Hang Out On The Internet

The problem with categorising Mijailovic is that he was "a threshold case", Sten Levander, a forensic psychiatry professor from Malmo University Hospital, told BBC News Online.

BBC: NEWS | Europe | Doctors split over mind of a killer

After gathering enough evidence to get a court order to investigate Kruse Wellwood, 16, and Cameron Moffat, 17, police bugged their homes, monitored their cell phones, and performed forensic analysis of their computers and phones for a history of their Internet activity and online and text conversations.

FORBES: Solving A Teen Murder By Following A Trail of Digital Evidence