Criminologist Jack Levin at Northeastern University said Lanza’s isolation and a possible rivalry with other mass killers are characteristics that the Sandy Hook gunman shares with other shooters.

“It is not surprising that a school shooter would be inspired to break a record that was left by another school shooter. We’ve seen this happen at Columbine, a massacre that inspired killers all over the world – in Finland, in Germany, in Brazil, Australia, Canada and the United States,” Levin told WCBS 880′s Paul Murnane. “They want to capture the attention of the world. They want desperately to become infamous and that’s why they talk about setting records, amassing large body counts.”