The province’s police watchdog has invoked its mandate after a 35-year-old man fell to his death at a Mississauga high-rise this week. It’s alleged that officers entered the man’s unit and attempted to negotiate with him. He then fell from a high floor, was transported to a local hospital and was later pronounced dead. The SIU is an independent civilian agency that probes incidents where people died or were seriously injured. Investigators also review incidents where sexual assault has been alleged, or a firearm was discharged at a person.