This is a real hard I.D. because it is either a juvenile Cooper's Hawk or a juvenile Northern Goshawk. If I saw this bird here in Alabama, I would say definitely "COOPER'S HAWK" because of the rarity of the Goshawk showing up here (there are documented sightings but VERY, VERY rare). However, the OP is in Ontario and that makes it more of a challenge I.D. Both look similar as juveniles. Also, there are variations in the juveniles Cooper's Hawks and Goshawks so you cannot go by chest markings and eyebrows per se alone. You might not be able to tell from the two pictures. I'm going to do some comparisons and see if it can be discerned.
You can't go by eyebrow alone because SOME juvenile Cooper's have it and some don't. Usually, the Goshawk's is a little stronger marked eyebrow than pictured, but there is too much variation to use that criteria alone. Because of where the OP is located, I would expect it to be a juvenile Northern Goshawk rather than a juvenile Cooper's hawk (the Cooper's is more likely to be that far north in the summer but not in winter whereas the Goshawk stays there year round). I emailed the picture to a real bird expert and will let you know what he says.
Thanks for the pictures & the challenge.