The teenaged girl who died in a single-vehicle rollover near Algonquin Provincial Park over the long weekend had graduated from high school just days before.

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 and Allison Neville, who are also in their late teens. They were airlifted to Sunnybrook Hospital Monday, where they remain in critical condition.

All three teens graduated from St. Brother Andrew Catholic High School in Markham on Friday, said the school’s principal, Dan Zaroski.

“We just ask that everyone keep the Girard, Timewell and Neville families in their prayers at this time,” Zaroski told CTV Toronto on Tuesday.

Many members of the community, including the 364 students who were part of Friday’s graduating class, are just learning of the tragedy, Zaroski said.

“As the news gets out, there will be a lot of devastation,” he said.

The flag at St. Brother Andrew Catholic High School was lowered to half-mast Tuesday, as the community learned of the news.

Zaroski said the school would be opened from 11 a.m. to 3 p.m. on Wednesday to allow students and staff to gather for support and prayer.

Police re-opened the southbound lanes of Highway 11 Tuesday morning, upon completing their investigation.