Jeffrey Marks, WDBJ Roanoke president and general manager, said he was "at a loss to figure out what happened" to Vester Lee Flanagan, the man who murdered two WDBJ journalists Aug. 26, in the 2 ½ years after Flanagan was dismissed from the station. Marks defended WDBJ's screening and hiring policy, saying it was a "very elaborate" one in which Flanagan, whose on air name was Bryce Williams, had received positive references from previous employers. Michael Malone has the story.