Thank you for responding. Yes I brought the chick (Henry) back in. The other chick that I brought in to keep him company was fine, running around with the other chicks. There are 3 hens in the chicken house and a dozen chicks. I have no idea which chicks go with which hen. Little Henry was still in the corner where I left him,/her, peeping loudly. Two hens went after the poor little chick. I snatched it up as soon as the hens went on the attack.
I think what happened is kids visiting gathered the eggs but they didn't follow instructions to pick up eggs from only one next. They picked up eggs from the floor behind the door. I checked the eggs with a flashlight bathe first egg was clear and the next two had chicks so I put them back, possibly in the wrong place, because this little chick hatched behind the door with no hen around. A little piece of shell was still stuck. It was shortly after that when a hen attacked it viciously.
Do you think I should put another chick in with it so it won't be lonesome? It's very quiet. It's so cute.