Yes, we had one kill 9 chickens in one night, come back and kill 5 more. My husband shot at it at very close range in an attempt to scare it off and it ran away then came back 30 minutes later while he was standing outside waiting for it and that was the last time it came back.
Your coop has to be 100% secure and able to withstand a sustained attack. As in the floor of the pen needs to be hardware cloth as well.
They get into a blood frenzy and they don’t stop killing until nothing is left alive in a contained area like a coop. They are not afraid of lights, noise, or people when they are in the middle of killing.