Roommate moved out and left behind her very aggressive cat any ideas of what to do I can't keep her because she attacks everyone

Take it hunting. Sorry I couldn't help myself. Good luck finding a solution.

That is a problem. You can take her to the Humane society but they will put her to sleep. You can Google cat rescue and see if any of them will take her. There are several rescue groups that are no kill.

Elaine is right you cannot take her too the humane society. But Petsmart will take her and try to find a new home for her. Good luck and God bless.

Well you can't take her to the humane society, she will be put down,but it is up to you,but since she's in your home she basically belongs to you now