A 21-year-old student, Cyrielle Vincent first witnessed Kimveer Gill, in the parking lot right away, just mere minutes before the shooting.
"We noticed him right away. He stood out with his black coat and mohawk." Vincent stated.
As the onslaught continued, Alain Diallo, pulled out his weapon from his hoister, and attempted to confront Kimveer Gill.
Kimveer retreated by running in the cafeteria, at the second level of the school.
Seeing the carnage unfold from the third floor, Devansh Srivastava, a 19 year-old student tried to take a snapshot of Kimveer from his cellphone.
Gill quickly noticed him and sprayed him with bullets. He miraculously wasn't hit.
Kimveer encountered James Santos and Anastasia De Sousa again.
Both were already wounded - and De Sousa was still alive.
James Santos was trying to pull Anastasia De Sousa to the safety of a wall behind which about eight people were hiding. She was still alive but in a state of shock, moaning and incoherent.
Gill pointed his rifle at Santos.
Then he asked about Anastasia. "Is she dead?"
"I don't know. Let me take her. Don't do anything." Santos replied.
Kimveer Gill shot - and killed - Anastasia De Sousa, four more times. No remorse whatsoever.
"Now, she's dead," Gill said.
As Gill attempted to hold James hostage with forcing him, to pick up his bag of firearms, the police wasn't obliging.
More and more police ushered into the college.
With a volley of six shots, Kimveer was wounded in his right arm.
Kimveer Gill, eventually let James Santos go.
With one shot, directly underneath his chin, the bullet eventually going into his brain, Kimveer Gill killed himself with his handgun.
List of Wounded Victims
Meaghan Hennegan (18) shot in the hip and forearm. Shot near Maissoneuve Blvd, outside the school.
Catalin Romero (18) shot in the stomach. Shot outside the school, near students smoking a cigratte.
Mihai Romero (19) shot in the buttocks, as he attempted to flee.
Hayder Kadhim (18) shot in the leg and head, outside the college.
Yves Morin (48) The school carpenter shot in the shoulder, trying to shield another student from harm's way.
Leslie Markofsky (22) Shot twice in the head, in the cafeteria. Was critically wounded, put in a coma and almost died.
James Santos (17) shot once next to Anastasia De Sousa.
Lisa Mezzacapa - shot in leg and arm.
Kaloyan Gueorguiev (19) shot twice in the forearm and cheek from the third floor as Kimveer tried to shot at Devansh Srivastava.
Linda Dydyk - English teacher shot with a grazed arm.
Josh Perl (18) - shot once in the arm.
Tony Proudfoot - wounded outside by passing, crossfire bullets from the police and Gill, hiding beside a Police car next to Catalin Romero.
List of Killed Victims
Anastasia De Sousa (18) Originally shot once in the cafeteria, was still alive and Kimveer Gill shot her four additional times, eventually killing her.