1 years service plus previous service as a Police Cadet with Metro Toronto 

On the night of October 12, 1977 , Sergeant McKean and his partner Constable Cliff Lipsett received information concerning an escapee from Warkworth Penitentiary, Gerald Chater. The report indicated that the escapee and a friend were seen loitering near the main entrance of the Anchor Inn. The friend was William Fredrick who had escaped from Collins Bay Maximum Security Federal Prison. He and Chater had committed a knife point robbery of the Collingwood Gas Station on October 10, 1977 . Fredrick subsequently purchased a 12 gauge shotgun which he sawed off. They were waiting for a cab with the intent of commandeering it and going to Peterborough to commit more robberies. Upon arrival the officer decided to approach from different directions. Sergeant McKean arrived first and came face to face with the suspects; grabbed one with each had by the scruff of the neck and began to walk them towards the cruiser. Chater broke away and fled and a scuffle took place with Fredrick who drew the shotgun from his pants, placed the muzzle against the Sergeant’s chest, pulled the trigger and killed him instantly. He then fled the scene and was arrested the next day.

On September 19, 1978 , William Fredrick pled guilty to first degree murder and was sentenced to life imprisonment without eligibility for parole for 25 years. In 1989, Fredrick commenced an early release application, under the provisions of Section 745 of the Criminal Code of Canada. The provision allows first degree murderers to apply for parole after 15 years. When he became eligible, Fredrick re-applied for an early release. and in October of 1996 the hearing proceeded. The hearing lasted three weeks and submitted the family of Sergeant McKean; his wife Ann and their three children, Elizabeth, Trevor and Christopher through the pain and anguish that Ann had gone through nineteen years before. The jury denied the application forcing Fredrick to complete his sentence. The Canadian Police Association has led a fight to have Section 745 repealed on behalf of the families of the victims.