Slaughterhouse Phi: Death Sisters (2006)

Yup, you know how bad this one is going to be just by looking at the cover art.  During a hazing ritual at an abandoned orphanage, one of the pledges accidentally dies.  Instead of calling for help or reporting the accident, the pledge leader decides to bury the dead girl.  You'd think the other pledges might be suspicious when they never see her again, but no.

A year later, the police have given up and her father has stopped pestering the sorority about his daughters whereabouts.  So the pledge leader decides it's okay to do the same hazing ritual in the same place.

Unbeknownst to them, the ghost of the dead girl has been murdering people.  A photographer takes a girl to the house to take some photos.  When she doesn't want to drop her top, the guy  physically assaults a girl after setting his camera on auto to take photos the assault. Yeah, not too bright, that one.  Fortunately the ghost shows up and save the day... until she also kills the girl.

Rusel Malone plays the detective, who looks so unlike a detective in his wood paneled basement office.  But we know he definitely is a detective by the trench coat and fedora he wears.  He's suspicious of the sorority girls, but has no evidence.

The ritual goes horribly wrong again due to the appearance of the murderous ghost.  When one is killed, they all run out of the house.  Inexplicably, they stop running once they get to the front porch.  After a long discussion, they decide that they need to go back into the house to get a cell phone to call for help... even though someone was just murdered and a killer is in the house.  Although the house is supposed to be thirty minutes from nearest town but you can see another roof off to the left of the driveway.  Gah!!  Terrible!