ammunition. by the time the officers arrived at the 32nd floor, creeping down the hallway, dripping with sweat, going low behind their shields -- >> okay, everyone take a deep breath. >> reporter: -- paddock was already dead. he'd shot himself after he gunned down 58 innocent people and wounded hundreds at the concert playing out down below. >> and matt gutman, who has been on this story from the start, with us live again tonight. and matt, police have just started releasing this body cam footage, and we know much more is expected to come out. they have thousands of hours they've poured through? >> reporter: that's right, david. what we saw tonight were the first three hours of it. and what's most striking is how much time elapses. we see those officers going floor to floor, sometimes they breach the wrong rooms. and throughout this process, more than six months after the shooting, we still do not have a final police report, no timeline, no firm understanding of why stephen paddock did this. david? >> matt gutman tonight. matt, thank you. now to the showdown tonight between president trump and the special counsel, robert mueller.