Vsackett
Chirping
What I suggest is to build a nice big run that is well fenced and predator proof as you can get it, and then put a net over it. That's what I did. Now when the hawks stop by (the National Forest is right across the street, we have tons of hawks and owls) I just enjoy them.
If you watch videos of hawks in action, they are amazing flyers and can fit through the tiniest hole among the bushes and trees. Putting up CDs on fishing line, or plastic owls etc, may initially astonish them but they will become accustomed to it and they will attack again. They are highly intelligent and persistent predators, I guess I can't really blame them for wanting to eat, and alas, chickens are pretty easy to catch. Heck, even _I_ can catch one.
Really sorry for your loss... that is just so heartbreaking.