Almost four years after a man drove his minivan into a St. Paul, Atla. school, killing two students and seriously injuring another, a fatality inquiry is set to begin.

The inquiry, scheduled to start at 10 a.m. Wednesday, will examine the events leading up to the Oct. 26, 2012 crash. That's when Richard Benson had a seizure while behind the wheel of his minivan.

He lost control of the vehicle, which crossed several lanes of traffic and crashed through the wall of Racette Junior High School at nearly 80 km/h. Benson had a history of seizures.

11-year-old Megan Wolitski was killed after a minivan came through the wall of her school. (Les Miskolzie)

Megan Wolitski, 11, was sitting with classmates when the minivan plowed into her classroom, hitting her and two other girls.

Wolitski died in hospital the next day.

Maddie Guitard died of her injuries earlier this month, after several years in a permanent vegetative state. She was 15.

Angelina Luce sustained a traumatic brain injury, which has damaged her speech and vision.

Benson eventually pleaded guilty to one count of criminal negligence causing death and two counts of criminal negligence causing bodily harm.

In November 2013, Benson was sentenced to two years and a lifetime driving ban.

Richard Benson was charged with two years, and a lifetime driving ban.

Benson was prone to seizures, and court documents revealed he rarely filled his prescriptions or his pills.

When he applied for another driver's licence and vehicle insurance in 2011, he failed to mention his health.

Just days before the accident, he had a seizure at home but did not go to the doctor.

The inquiry is schedule to last three days and will be held in St. Paul Provincial Court.