NYPD's Miller on why WDBJ shooter was a "classic injustice collector"
John Miller, New York City's deputy police commissioner for intelligence and counterterrorism, joins “CBS This Morning” to discuss how Vester Lee Flanagan II, also known as Bryce Williams, exhibited text-book behaviors in the deadly shooting of a WDBJ news crew in Virginia. Miller is a former assistant FBI director and CBS News’ former senior correspondent.