Jeepers, sorry about your chicken.
I know that raccoons can be real pests.
I still like the little buggers, though.
You’re likely already doing what this website recommends, but if not and since your chickens come first...
https://ellieandherchickens.com/how-to-keep-raccoons-out-of-the-chicken-coop/
Raccoons are smart and are difficult to catch.
They have hands, just like humans, not paws like other animals. The trap I use is a live trap and then I take the animal out on Eglin AFB range about 6 miles from home and turn them loose.
When I first started using the trap, borrowed from next door neighbor, the bait would disappear but the trap was not tripped. I thought mice or a rat was getting it and didn’t weigh enough to trip the trap.
It was the raccoons reaching into the sides of the cage and taking the bait without going into the trap itself.
Once I figured that out, I put screen wire around the outside of the trap so they couldn’t put their hands through it.
But they figured that out and just ripped the screen away.
Then I put the screen back on and tied it down with a brick on each side of the cage and backend.
They moved the bricks.
Finally I got some heavy cement blocks and they couldn’t move those, so I caught 4 raccoons over the last two weeks.............