Hawk, coon, cat, or something else?

My 14yo son and 12yo daughter were putting away the chickens, who had free ranged throughout most of the day. When our sweet little Blue Andalusian was missing from the coop just before lockdown, my daughter went looking for her. She found her body under a tree and came crying inside. My son and I went to investigate and discovered that our Bluebell had been killed by an unknown predator. She had a gash near her breast, and the skin was stripped from her head and neck. She had also been just recently killed - rigor mortis had not begun to set in. Her little feathers are scattered all under the tree, too. We are trying to figure out what might have killed her, and have come up with a few possibilities:

- a young/small hawk who may have been planning to return
- a raccoon or possum (but just before dusk?, and wouldn't it have gone after more?)
- a stray cat: we have two outside cats who aren't buddies, but they never, ever fight. Last night, however, we heard a cat fight near our garage. Of course, it's possible that the fight was with a raccoon or other wild animal, too. One of our cats is nearly feral - we know he's around, but we rarely see him, so it wouldn't be easy to see if he's been injured. Of course, it could be one of our cats, but they've never bothered a chicken before, and we had them even in California when we had chickens (who always were out free ranging) for nearly two years.

This is our first loss to a predator. Based on what I've described, do any of the scenarios I've listed seem more or less likely, or is there another possibility? Also, now what do I do? I do have a trap. Should I set it near the tree where she was killed, or near the coop? Both the tree and the coop are stand-alone structures - there are no other trees near them, so they are both out in the open.