Canada Shooting Hero's Brother 'Very Proud'

Lawmakers say Sergeant at Arms Kevin Vicker saved their lives when he shot and killed the gunman.
3:17 | 10/23/14

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Transcript for Canada Shooting Hero's Brother 'Very Proud'
And good morning, America. What a terrifying day it was. We've all watched it play out. What a scary scene. We've seen it all too often. A major city on lockdown. The police all over Canada's capital. What an extraordinary scene. Inside the Canadian parliament. The members forced to barricade themselves inside to protect themselves from the shooter. Just so much chaos. And security is stepped up here in the U.S. As well. Including at the tomb of the unknown soldier and the Canadian embassy. Everybody's on high alert. We have team coverage beginning with Dan Harris in ottawa. Good morning, Dan. Reporter: George. Good morning. Right behind me here, the war memorial and the parliament building where these acts of violence played out within minutes. This morning, learning much more about the suspected shooter and the act of raw courage that stopped him in his tracks. A day of horror in the normally quiet capital city of ottawa. It all started before 10:00 A.M. When the suspect, a 32-year-old Canadian names Michael zehaf ki bow, a petty criminal who converted to Islam, walked up to the war memorial and shot and killed Nathan Cirillo, guarding the memorial. His head was halve covered with a scarf. He raised his hands in triumph. By-standers trying to resuscitate him, but he later died. And gunfire in the parliament building nearby. This video catches the chaos. Law makers and reporters scrambling for cover. Barricading themselves inside of rooms. The prime minister, Stephen Harper whisked to safety. Reporter comic Mcsweeny was on the phone with his editor when the chaos erupted. I don't know. There's a bunch -- a bunch of gun shots. A single guy came in with a shotgun. There were -- yes, yes, put me on air right now. Reporter: The rampage only ending when a sergeant at arms, Kevin Vickers, shot and killed him. Vickers role was largely ceremonial. He wore robes, but he had access to a firearm and clearly knew how to use it. With law makers saying Vickers saved their lives, "Gma" tracked down his brother. In a time of need, he was there. And he did what he had to do and we're just very, very proud. Reporter:but even after the gunman was stopped, police fearing other shooters on the loose swarmed in the city center. They used a robot to search the car the suspect was driving for sploes is. People on lockdown told not to move or go near windows for hours. And this morning, that lockdown which lasted well into the evening is finally lifted. You can see cars streaming mi iing behind me. Parts of this area are a crime scene as they answer two major looms questions. What was his motive and did he act alone?

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

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