If only one predator, then raccoon.
Show a picture of setup so we can harden it against incursions before predator returns tonight. Be prepared to leave most recent carcass where you found it to by some time where predator concentrates on that as you do your work. I have outright moved small groups of chickens for a night or two when I could not make changes needed fast enough.
A live trap or dog proof trap can be placed to catch critter. Dispatch it if captured.
Consider using electrified wire around perimeter of poultry area.
Get a game camera and set it up to work on 30 second intervals.