murder mystery in the backyard

Friends: I'd love to have your help to figure out what bird was murdered in our backyard. I am pretty sure I know who did it... we have a neighbourhood cat who is often on the prowl... I just need to know which of my feathered friends it was. 

​Here is a photo of what remained:

You could just guess, OR the U.S. Fish And Wildlife Service has a Forensics Laboratory and Feather Atlas where you can search feathers by colour, pattern, size, position, and type of bird. So if you have a feather collection like I do, it can be very helpful as you try to discern which bird body it belonged to. 

Here is some information about the feathers pictured above:

Colour: If you can't detect shade from this photo, I'll tell you what colours my eyes see: there are varying degrees of grey, some black, and some white, and then at the far left end, some shades of brown.

Size: The feather at the far right is 13cm long. The all grey feather in the middle, just to the left of the one that has white on its tip and left side, is 9cm long. The feather at the far left, with some black, brown, and black spot on brown, is 6.5cm long. 

Habitat: I live in the city, on the border of Waterloo-Kitchener, and have a backyard bird feeder. There is no water around, so this is no water fowl.

​What do you think?