Mary Ellen O’Toole calls the teenagers who murdered 13 people at Columbine High School in 1999 by their first names — Dylan and Eric. O’Toole did not personally know Dylan Klebold and Eric Harris, but she’s thought about them for decades. At the time of the Colorado shootings, O’Toole was a profiler for the FBI and had been tapped to write the bureau’s report on how to prevent mass shootings in schools. What began as a research project has become a life’s work — and a deep source of frustration.

Source: These Researchers Have Been Trying To Stop School Shootings For 20 Years | FiveThirtyEight