all stabbed multiple times. likely a person who went there to rape one, the others were inside , one saw him , had to kill her.this woke the others , had to kill them too.
too much blood.too much noise. no time to rape without risking being caught.
fled.
white male, 5'9, approxmitely 200 lbs. wearing a hoody.
thats my guess. or the ex boyfriend.