Key Characteristics of Mass Shooters - NBC 7 San Diego

Full coverage of the shootings at the midnight showing of "The Dark Knight Rises" in Aurora, Colo.

Key Characteristics of Mass Shooters

While what happened in Aurora, Colorado may never make sense to us, there are some common connections with mass shooters. San Diego psychiatrist Clark Smith M.D. has worked on several high profile cases and shares his opinions with NBC 7s Tony Shin. Get more coverage in our special section "The Dark Knight" Massacre