Transcript for Inside the Hectic Scene in Canada's Parliament Building
These it right here are the steps the gunman ran out during his Rampage after an all day lockdown yesterday today there are letting us back into the building. The gunman then came directly through this entryway where he tangle with some of the security guards bullets started to fly. At this point the gunman while being shot at started running down this long hallway. This is the incredible part he ran by these two rooms which were filled with members of parliament in fact the prime minister himself was in this room. At this point the gunman continues to run down this hallway bear in mind is being shot at the whole time and this where he decides to hide he hides. I think you can see it here this killer on the right this granite pillar he hide right behind there the sergeant in arms here. Is a largely ceremonial post but he does have access to a firearm and knows how to use it so at this point Kevin Vickerson this sergeant in arms. Comes out of his office. Rounds the corner with a firearm. And goes a roof over there and personally finishes the job and shooting the gunman. He dies here on the scene so an extraordinary. Scene taking place here in the Canadian parliament. Eighty is something this country will not soon forget many people say it may change. This country.
This transcript has been automatically generated and may not be 100% accurate.