More details emerge on the Vegas shooter's work history and finances as well as statements from the shooter's girlfriend's sisters. A new propaganda video from ISIS was released but the motive is still a wide open question. Was the shooter’s psychological break related to him wanting to continue his father’s criminal legacy? Were the concert goers merely representational targets of people the killer despised? Retired FBI Special Agent James Fitzgerald, the criminal profiler from the Unabomber case, joins Dan and Amy with insight on the investigation into the mass shooting in Las Vegas.