I just had a family of red tails move in and nested to raising their young. Even worse...... Best advice I have is: use fishing line and a 2x4 with a screw or two in the top. Basically make a spider web in fenced coop area or make one. If they (hawks) don't feel they have ample space to land and get out they will not attempt. (Hopefully). They are federally protected. I have been on them....and luckily haven't lost one hen. I also used black deer netting. Scare crow that I move and change the hat on a day to day basis. The hawks watch me walk out to water, feed, and let the hens your every morning. I started to wear hunting caps with bright orange and sun hats. I was able to make a loud bang 6" under the birds sitting on a fence close by and scared them. We will see. Sorry to hear about your loss. If interested or you have additional advice glad to hear!