Breaking down the night of the Las Vegas massacre moment-by-moment: Part 2

After a 10-month-long police investigation, surveillance footage and 3D models pieced together show the shooter's movements, and victims share how far they've come since that day.
8:14 | 12/19/18

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Transcript for Breaking down the night of the Las Vegas massacre moment-by-moment: Part 2
Reporter: O 1, , Las Vegas metropolitan police arrespondingo reports of an active shooter at the route haest festival. Rookie Brandon and veteran offir Cole wereust beginning the graveyahift when th massacre began. Fully autom fire from a elevated. Takecover. While we're drivingthere, we can hear every somebody U microphe on duty, we can hear automatic gunfire. As soon as we show up, it's time to go work. Ied tool body we could right off the bat. Ee everody, keep G. And then that's we met frank. He came over to ournd he's carry his wifjovana, in S arms, anhe said,adiya leton help P She appearefeless. At that point, we obviously knew this was very critical. Hold that door. Let's go Female with ashound to the H We're there, man. Hang on Hurry up! Just driving as fast as we can andfrans in the backseat and he's yelling atna to hang on One minute, man. One minute. Keep lking to H. Makeure you dohest compssions, ma I rem banging on the and I hear Brandon in th front,nd he's telling me, keep going chest compressisnd we'relmostthere. Ais point, E blood -- she was bleeding everywhere, like her entire body was cered in blood. And weed her into the emergency room and I just remember yelling, hey,av gunshot wound to the head. Where doouant her? Right here, right here. We seter Dow andt ke the first moment that Yo hao -- chance to take a breath and I lked down and I'm covered -- covered in blood.loed at Andon. Heaid, what we do I ids go. We got to back. Shannon, call the police. Somes firin a G here. Someone'siring a rif on the 32nd floor down the hallway Responding to 32. Reporter: Inside mandalay bay, Steven sc, the security guard jesu mpos,ave a authorities to the shooter's location. We'ret op right now. Rter: Polic S out, sweeping through the ho over youhead. Show me your reporter: T M have passed since fst gots. By this point, the shooter has gone quiet. On the 32ndoor, schnd campos escape T safety as police and security W to get E guests of their rooms. Metro police, let me see your hands.hands! Go, go, go. 'S Ready? Watch for booby trap no comut of the building. You got long? I got shotgun copy. We should be a floor belowyou. Orlobelow, a eam makes theiray to that stairwell. Shiel, seld up. You guys dog a Phenomenal joy E way.ers are on later. Reporter: Right next to the R's room, ey game out how to make Orce open tholted door. And rig the door to the suite with aexplosive strip. Stand by for breach. Reporter: Then, a warning. Ach, breach, breach. Everyone in the hallwaydstoback. L units move back. Breach, breach, breach. . Okay. Over on that. In with you. C Reporter: They find the oote by a self-inflicted Gunst wound. Cameras up on the peepholes and a that. Ha these are. Reporter:n both rooms,r 1,000 gun shell casings. Stillad over 5,000 rounds hallway leading up to the shte Sas sealed off fr public view now. Chunks of wall aresing because it' been taken out as evidenceause sl and bullets were flying down this hallhot from all the way in their Reporter: Behind this door, investigators found 2ons arm piercing bullets. A pn ca inourcountry, can go out and B that many weapons and not break the law til on those kills a human being. A cha for law enforcemen Reporter: And just Toda the bump stocks, but N rig advocates immediately led suit tstan. The final toll,ering. 58 dead. More than 850 injured. T's hard cpr what happened, even to thisday, after the shooting we wentack dn our nextas T clear the concert grounds and look for anybody who was still alivand hiding. Thener was done, O T neome pick them up until about 8:00 in the morning. Orter: Lat that they head back to the hospital to check a wounded officer and the young woman they H cad Going to the hospital and learn she actually alive W kind oke nso a dark D. I saw it in their face that them, you know, be proud. You , you guys got my he. Reporter: For frank and jovana, their swiftions meant the fferenceetween life and death. There's not but love R those two guys. Yeah. For sure. I -- I am speechless. I don't know what words to say to them. That I'm grateful. They sed my life. Reporter: We'll be right back.t

This transcript has been automatically generated and may not be 100% accurate.

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