Aries:

The one who tried to comfort the killer but dies

Taurus:

The one who has all the supplies; weapons; food; etc

Gemini:

Sets the trap for catching the killer

Cancer:

Is hiding upstairs from Pisces

Leo:

Guarding the room where Cancer and Pisces are

Virgo:

Tells everyone to keep calm and stay together

Libra:

Tried to diplomatically talk the killer out of murdering everyone

Scorpio:

Goes on a hunt the killer of murdering Aries

Sagittarius:

Gets bored in the beginning and left, comes back in the aftermath

Capricorn:

The Killer

Aquarius:

Disobeys Virgo's rules for sticking together and keeping calm

Pisces:

Is hiding upstairs with Cancer