For the past several years, we've had a very sweet-tempered rooster to watch over our flock. This boy (seen in the middle on the perch) is protective towards the hens, human- and kid-friendly, and has never harmed a chick.
We also have a newer rooster, a Brahma which was hatched last year. This one isn't the dominant roo, but recently he's been trying to woo some of the hens, crow more, etc. He also started attacking my children lately, up to the point they are afraid to go out into the yard when he's around. So I've been thinking about getting rid of him for some time. It's not like we need him for breeding (we don't have any Brahma hens so anything he breeds will be crosses).
Today was the limit. Yesterday, some new chicks were hatched, and today when I came into the coop I saw one bloody dead chick on the floor and the Brahma roo pecking at it. I was nauseated. Never had this happen before; the chicks were with their mother, in case you are wondering, but she's a smallish hen and probably couldn't protect him.
I isolated the villain at once, told my husband and later he called me from work and said a friend of his will come in the afternoon to pick up the rooster. Only wish I'd have done this sooner...