The province's Special Investigations Unit has confirmed that a 37-year-old mother, and her three young daughters died in a tragic crash in Brampton on Thursday.
The daughters were ages 1, 4, and 6.
A 20-year-old man who was driving the vehicle that crashed into their's is in life-threatening condition.
So far no specific details on what led to or caused the crash have been released, but the SIU says a police officer "observed" the car that crashed into the family's SUV before the collision happened.
The SIU will not be able to release much information until its investigation is complete.