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This may sound strange, but I would not be so certain that 'Atilla' is a killer. sick birds are often the targets of pecking. The dead chick may have been ill before Atilla began her own onslaught! a weak or sick chick is not able to get away from a bully, or becomes weaker sooner.
I would want to know a lot more about your brooder. What are you feeding? you mentioned egg?! what is your brooder? cage, crate, room? What temp do you have the brooder at? is the light a heat light or just a bulb. Where are you taking your temp reading from, under the light, or on the edge of the brooder?
There are a lot of variables here that can cause the death of chick in very little time. and just because attilla was pecking at a sick chick doesnt mean she killed it. The fact that she was pecking at it does possibly point to many other things tho. Chicks peck at things to get a taste. lots of different things for them to peck at will diminish the amount of pecking they do on each other! Veggies, (Broccolli is a good one!) will give them something to pick at. Scratch feed spread out on the brooder floor is also stimulating!
Find out what Atilla is searching for as chickens are not 'mean', just doing what instinct tells them.
Good Luck.