In vegas. A new timeline including a substantially revised account of the moments before the mass killing began. Cnns in vegas where she joins us now. So explain this new timeline where the sheriff now says happened. Reporter well, anderson, just as you said, this is a significant shift. Up until now our information was that the gunman on the 32nd floor of the mandalay bay hoilgts was firing on this crowd, this crowd of 22,000 innocent concertgoers, and then he turned his gunfire to the Security Guard. So shoot at the crowd first then turns to the Security Guard and that diverts the gunfire from the crowd to the Security Guard. The information were getting today from the sheriff is that the Security Guard, jesus campos was shot first. Here is what the sheriff said. He was injured prior to the mass volley of shooting. What we have learned is mr. Campos was encountered by the suspect prior to his shooting to the outside world. Reporter and this is a significant time shift because accordi