AJAX, Ont. -- Ontario's police watchdog says a 47-year-old man shot by a police officer in Ajax has died in a Toronto hospital.

The Special Investigations Unit was called in Monday after the man was shot by a Durham regional police officer responding to a disturbance call in the town east of Toronto.

The agency says officers were sent to an address (on Unsworth Crescent) after receiving multiple disturbance calls about a man acting strangely.

The SIU says the officers located the man a short distance away and there was an "interaction" between police and the man, at which point an officer fired his gun, striking the man.

He was taken to a local hospital and then airlifted to St. Michael's Hospital in Toronto, where he succumbed to his injuries at 4 a.m. Tuesday.

The SIU says the man's name is not being released at the request of his family.

The SIU is an arm's-length agency that investigates reports involving police where there has been death, serious injury or allegations of sexual assault.