It's just outside Collingwood ... i think only a few kms
Probably not related as it goes back a lot of years (am guessing the perp would be mid late 50s or early 60s now), but there was another terrible case in the Orangeville/Georgetown area around 1972. I worked in Toronto with the victim's dad, but never knew the perp's name (i think it was not published because his victim was a young teen). The perp and his wife were attending a wedding where the girl's parents were also attending. Perp feigned a headache so he and his wife left to go home; then he went out again alone on the pretense of needing fresh air. He went to the victim's family home in Georgetown where the girl was babysitting, tricked her into opening the door by saying he had car trouble and asked to use the phone. She initially refused, but iirc, he came back again and when she opened the door, he stabbed her multiple times and left her for dead.
His courageous young victim survived, but was left blinded in one eye. I never heard the outcome of the trial as I had moved out of the area. There was certainly enough evidence, so am sure he would have been found guilty.
How horrible for this young girl and her family,I hope the perp is still in jail but somehow I think not. Georgetown (if it is the place I am thinking of) is a very charming town with a horseback riding facility in the area...