In 2004 , a National Film Board of Canada film about Professor Leyton 's life 's work titled '' The Man Who Studies Murder '' , was premiered at the Montreal Film Festival and aired on CBC Television ’s '' The Nature of Things '' . Frequently consulted by the media , Professor Leyton was interviewed by CBC Newsworld on September 14 , 2006 about the Dawson College shooting in Montreal . He stated that because all three such murderous rampages in Quebec involved a killer who was either an immigrant or a child of immigrants , it warranted an examination of government and societal attitudes that can profoundly impact immigrant perceptions and hence their conduct . The following day , Professor Leyton was the guest expert on CBC Radio One 's program '' The Current '' that analyzed the Dawson College shooting
Dawson College shooting
Dawson College shooting
Elliott Leyton