We have to get him up. >> I can't move him on my own. I can't I can't GET HIM UP. >> COME ON. COME ON. Let's go. LET'S GO. >> WHERE DID THE SHOT COME FROM? >> I DON'T KNOW. >> 50-21 George, we're on scene at a 10-1. Keep the cars coming. We got an active shooter in the area. Notify responding units there's plainclothes at the scene. I need all intersections [screaming] blocked to mid. Have a supervisor initiate an officer down detail. Come on, buddy. Come on. >> It's got to be A SOUTH-FACING BALCONY. >> You see anything? >> Nothing. >> Stay with me, Anthony. Stay with me. >> No, back inside. Back inside. >> All right. Hey, no one leaves this building. Get me some units around back. Have them cover all sides. >> [groaning] >> CPD, everybody. >> All right. Go door-to-door. Gather everyone in the lobby. Everyone gets interviewed. >> What up, Sarge? Well, based on the area officer that was shot is Anthony O'Sullivan. He was responding to a man in the lobby with a gun, so we're searching the whole complex right now. There's only two months out there, Captain. Sarge. >> What's his training officer say? >> He's on the way to med right now, but he said he didn't hear or see the shot. >> Well, the original call was a man with a gun. Give me the time and location. Make sure the kid's family's headed over to the hospital. >> Copy. >> Sarge. We need you up here, boss. Eighth floor. >> Single .223 round, probably an AR-15. This was an execution. >> Shooter's in the wind. It's [music] unknown how many offenders at this time. Looks like he or they were lying in wait. Only one shot fired. >> If this is like Dallas, we need to worry about contagion. Sympathizers, copycats. I'll keep details limited. >> I'm in contact with CPIC, FBI, and Homeland. Running every active threat against police. >> Hank, I want you running point on this. Citywide. >> Yeah. >> I'm sorry. We did everything we could. I'm very sorry. >> Anthony O'Sullivan. He grew up in Saginaw. Still living with his parents. He was class commander and graduated first of his class from the academy 2 months ago. Here, I only pulled our latest and greatest active threats to police. >> Yeah, we got two whites that uh aligned with two anti-government groups. >> And our top six are bangers who attended a summit last month. Three Westside gangs were in attendance. They vowed to kill police officers for the killing of young black men. >> Word on the street is they had snipers on the roof last night. >> So, patrol still has no suspects. There was no 911 calls for shots fired, so we're thinking that the shooter used a flash suppressor and a silencer and most likely is monitoring our radios. >> Nothing on ballistics. Bullet doesn't match a gun on file. >> Your office? >> Let's start narrowing. Who has access to a gun? Who's online spewing hate? And I don't care if that crime scene was licked clean. There's a path that leads straight to that balcony. >> They don't want cops in this city, that's fine. Let's pull out. Let's pull out. Let them police themselves. See how long that last. >> Right down there. Car's parked at the tail end of a dead end alley. No one's approached. >> see any movement inside the vehicle? >> No. Plainclothes walked by. Car looks [music] cold. Looks like he ditched it. We almost missed it back there. >> We'll approach with you just in case >> she's in there laying low. >> All right. >> Let's go. >> Chicago PD! Anybody in the car, COME OUT WITH YOUR HANDS UP! >> Is that your radio? >> I think so, yeah. >> Wait. Wait. Hold up. Something doesn't feel right. Aaron, check your radio. >> GET DOWN! >> MY LEG! >> WHERE DID THAT COME FROM? >> MY LEG! >> GOING COVERS! >> GO GET YOUR SQUAD! GO GET YOUR SQUAD! GO! >> WHERE IS HE? WHERE IS HE? >> TURN THE GLOCK ON THE ROOF! >> I'M ON IT. GOT IT. >> GO! GO! GO! GO! GO! >> HOLD ON. HOLD ON. REALLY, HOLD ON. >> WILL, YOU COVER US. >> GOT YOU. >> COME ON. COME ON. COME ON. COME ON. GET US THE HELL OUT OF HERE. >> HE'S MOVING. >> GARCIA, YOU GET ON THE HORN. YOU CALL A 10-1 RIGHT NOW. WE NEED BACKUP. >> COPY THAT. >> RUN DOWN THE BLOCK. >> LET'S GO. LET'S GO. >> GO. GO. GO. >> You're clear? >> Uh we got a rope. He repelled down. >> Need a location. >> 50-21 George. We're on scene of a 10-1. We got an officer inbound with a gunshot wound to the head. Offender believed to be on foot heading westbound on the rooftops. Roll air one. >> Easy. >> Copy that. >> Here. >> Talk to me. >> She's been down 8 minutes. >> All right. Let's get her on the gurney. >> Will, I can't move my hands. >> All right. I got her. >> Okay. I got her. >> Let's go. Keep moving. Um Will Will says that she uh she died before she hit the ground for whatever. >> Okay, so we know area central and patrol shut the whole block down. I know a perimeter search is underway, but every camera in the area was vandalized. It's the highway was spitting distance. >> Did we get a look at him? >> Boss, he kept low. This guy, the way he shot, he was trained. >> He was military. The truck was a lure. It was bait. We never should have been in the alley. That son of a [ __ ] knew we'd come IN HOT. WE HAD no cover. He had a remote vantage point, triangulated us from above, and then WE WERE FREAKING TARGET PRACTICE. >> He jammed a frequency. >> All cell phones and the radios, they were all down. >> Put a call into OEM C and tech lab. Let me know as soon as you hear. >> Black four-door sedan coming your way. >> I suppose that's him. What's he doing? He made us move. >> [groaning] >> Do not move. Turn the car off nice and slow. NOW PUT YOUR HANDS OUTSIDE THE VEHICLE. DO IT OR WE WILL LIGHT YOU UP. DO IT NOW. >> [ __ ] the drone. >> Hope every cop in the city gets smoked. >> Shut up. >> Get him in the cage.