By this time, police had arrived and had assembled outside. Several went to cover the exits, lest the gunman slip away, but it took nearly twenty minutes before they decided to enter. They were not certain where he was and did not wish to endanger anyone. Calls went to a dispatcher for more ambulances, and those wounded students who could walk on their own went to meet them at the roadblocks.
Lepine then walked up an escalator to the third floor where he shot and wounded one female and two male students in the corridor. He entered another classroom and told the three students giving a presentation to 'get out,' shooting and wounding Maryse Leclair, who was standing on the low platform at the front of the classroom. He fired on students in the front row and then killed two women who were trying to escape the room; other students dove under their desks. Lepine fired towards some of the female students, wounding three of them and killing another.
He changed the magazine in his weapon and moved to the front of the class, shooting in all directions. At this point, the wounded Leclair asked for help. Maryse Leclair was down, but still alive. She pleaded for assistance, which attracted the gunman back to her. Those who survived this bloodbath recounted for newspapers what he did next. The strange young man sat down next to the wounded woman, quietly pulled a knife from the sheath strapped to his body, and used it to stab her in the heart. She screamed in surprise and pain. This violent act shocked those who were watching. The man had no mercy, but there was nothing anyone could do. He pulled the knife out and then plunged it in twice more until the girl laid silent, blood gushing from her wounds.
The gunman said, “Ah, shit.” He turned the rifle’s barrel toward his own face, pressed the muzzle against his forehead, and pulled the trigger. The rifle exploded, blowing off part of his skull and he fell to the floor. No one moved. The place smelled of hot metal, gunpowder, and fresh blood. Nevertheless, clearly it was over.
About sixty bullets remained in the boxes he carried with him. He had killed fourteen women in total (twelve engineering students, one nursing student, and one employee of the university) and injured fourteen other people, including four men.
As police came in, Montreal Police Director of Public Relations Pierre Leclair entered the building and went from one floor to another to assess the situation. Through a window in the third-floor corridor, he saw a young woman lying on a platform, on her back. He stopped. He could not believe what he was seeing. It was his daughter. Rushing to her, he realized that she was among those who had been killed; more horribly, she had been stabbed as well as shot.
It would take a while to piece together why Lepine had caused so much slaughter, but he had stated enough about his intent for students to tell reporters that his rampage had been anti-feminist. He had wanted to shoot only women.
A three-page letter was found in the pocket of his jacket. The letter was never officially made public, but was leaked in November of 1990 to Francine Pelletier, and published in the newspaper, La Presse. In his suicide letter, Lepine cited political motives, blaming feminists for ruining his life. He considered himself rational and expressed admiration for Denis Lortie, who had mounted an attack on the Quebec National Assembly in 1984 for political reasons, killing three Quebec government employees. The letter also contained a list of nineteen Quebec women whom Lepine apparently wished to kill because of their feminism. Another letter, written to a friend, promised the explanation to the massacre lay by following clues left in Lepine's apartment. The hunt led only to a suitcase of computer games and hardware.
The following is a translation of the suicide letter written by Lepine on the day of the shooting:
The following is a list of those senselessly killed in cold blood on December 6, 1989. God bless them: