I'm very sorry for your loss. Attacks are so disturbing to the chickens. If your run is covered, I'd keep the chickens locked in temporarily and hope it moves on. Maybe you could give the chickens some extra snacks in the run.
There are suggestions on all the previous hawk threads you can try. Hanging cds around that flash or giving them extra cover to hide under. Some people have tried fake owls. Having a dog around or any type of livestock right with the chickens usually helps. With a big chicken, it's going to mean more time on the ground to eat the kill. Dogs running around or livestock next to the chicken makes it look like a much higher risk attack. That has worked the best for me. With small chickens that they can take off with, they don't have to be quite as careful.
Some chickens are better at free ranging than others. Chickens that have their vision obscured by feathers have a terrible time seeing what's coming. Flightier, more nervous birds seem to be a little better at it than heavy, calmer birds. Birds that have been attacked or seen their flock mates killed are usually more careful than birds that have never experienced it. Roosters often are better at keeping watch than hens and can give an early warning call. Hens are very intent little foragers, that can lose track of what's going on in their environment.
Some people have said that over time, they have developed a flock that was more successful free ranging. The birds that can learn and adapt live and the others don't and are lost. This is a tough way to go if you love your chickens. It does mean yours may be more careful now, watch a little more or stay under cover a little more.
Until you figure out what you want to do, at least your chickens would be safe in the run. Once a hawk targets your chickens, you often have further losses right away.
