A small memorial gathered outside a Markham high school on Wednesday, after a former student was killed and two others critically injured in a car crash over the Canada Day long weekend.

Candles, flowers and a note of condolence were left at the doors of St. Brother Andre Catholic High School, from where the three victims had recently graduated.

Sara Girard, 17, of Stouffville, was pronounced dead at the scene of the crash on Highway 11 in Armour Township when Ontario Provincial Police arrived Monday evening.

Two others in the vehicle, the driver and a passenger, have been identified as Meghan Timewell, 18, and Allison Neville, 17.

They were airlifted to Sunnybrook Hospital Monday, where they remain in critical condition.

The school’s flag has been lowered to half-staff and the school’s cafeteria and chapel will be open through the day for students and staff in mourning.

“The familiar faces will be in the building to support the students,” Principal Dan Zaroski told CTV Toronto.

“We just want to be there as a community to support them and the families involved.”

Zaroski said the community is still in shock. Many teachers just saw Girard, Timewell and Neville at graduation on Friday, he said.

Students and parents from the Markham high school were also shaken by the news.

“It just hasn’t sunken in at all yet. We were just on our Wasaga trip, our end of the school year trip,” said fellow student Robert Chalkley.

“We were just saying goodbye to everyone, we’re all going to different universities -- we’re not going to see each other again. You didn’t think we weren’t going to see each other in this way,” said Chalkley.

Markham area parent Bill Watling was so moved by news of Girard’s death that he dropped by the high school to leave flowers at the memorial.

“I have a 17-year-old daughter who goes to a sister school here in Markham,” said Watling. “I just thought how easily this could have been her. It just made me feel compelled to leave some flowers. My heart goes out to the family,” he said.

With a report from CTV Toronto’s John Musselman