Welcome to BYC! Glad you decided to join our flock. I'm sorry about the loss of your hen. I would definitely get rid of an aggressive rooster. As Wynadottes7 said, you don't want to breed that kind of aggression into your flock. How many hens do you have? The recommended ratio of roosters to hens is 1 rooster for every 10 hens. If you do not have enough hens, any rooster will be very hard physically on your hens; over-breeding them, biting and plucking the feathers from their necks and backs; battering them, and potentially seriously injuring them or even killing them. The only reason you really need a rooster is to fertilize eggs for hatching, and 1 rooster can easily handle 10 hens in that regard. I currently have 25 hens and no roosters in my flock, and I get loads of eggs without all the aggression, fighting, biting and plucking of feathers, crowing in the middle of the night, drop off in egg production, and over-breeding and battering of hens that goes along with having roosters (especially too many). My hens are stress free and enjoying life without a rooster around. Please feel free to ask any questions you may have. We are here to help in any way we can. Good luck with your flock.
and Welcome To BYC! Sorry about the loss of your hen 
