Backyard Visitor

Earlier today I heard a screaming outside...
I went to see what all the clatter was about.
There was this very large bird flying around, then landed in a tree. I ran to get my camera, and this is what I snapped:

I thought it to be an owl at first..it was up quite high, had to zoom in with my camera..
After looking at the photo, It didn't look like an owl to me anymore...I thought perhaps a hawk.
I am not so sure about either, if you look at the beak, it is straight and not hook billed.
It appears to be a young bird..although large in size.
It has the sweetest face!

Anyone know what type of bird this might be?
Louise
***Edited to add***
Thank you to Abbie for your comment...I looked at the photos of a Swainson Hawk..but not sure the markings on the chest are just alike or not..I did look up Red Shouldered Hawk and noticed the chest has the same color marking and horizontal lines as the bird in my picture. The straight beak stumps me though! Might just be the picture itself and it's beak really isn't straight at all...