Ken Mead helped lead the investigation into the shooter’s motive and interrogation of the girlfriend in the largest mass shooting in the history of the United States that happened in front of Mandalay Bay at the Route 91 Harvest Country Music Festival on October 1, 2017. Although Ken has trained dozens of law enforcement agencies on this incident, this is his first public interview. He answers some of the most critical questions, including whether there was more than one shooter and whether the girlfriend knew what was going to happen.