The legal responsibility of a landlord for injury to a tenant or other person, resulting from the criminal acts of a third party, vary enormously by jurisdiction.
It is my impression from the limited amount of relevant case law available on LexisOne, that a landlord's failure to respond appropriately to a pattern of criminal acts in an apartment complex may give rise to liability. Whether the fact pattern you describe is sufficient is something that you should discuss with a Georgia lawyer who is familiar with that state's premises liability law.

