Police were called to St. Dorothy Catholic School, near John Garland Boulevard, after reports of a crash at around 9 p.m.
According to police, the vehicle — travelling the wrong way on the road — jumped the curb and ended up crashing into the school.
Two people were in the vehicle. The passenger, a man in his 20s, was taken to hospital with serious injuries.
It is not yet clear how or why police were involved in the incident.
The SIU is called in to investigate whenever police are involved in an incident that results in a death or serious injury.