I saw this movie on tv maybe 6 or 7 years ago, maybe more, in color, in English, was a college movie.
started with a new student (guy) coming to college and a student (girl with red hair), helping him and showing him around , then he spend time with her and her friends.
they invite him to a poker game (maybe!).
then they started to get killed mysteriously , they were scared!
I remember a scene when she (the girl with red hair) was outside and he was(the new guy) inside the house she was running and knocking the door in crazy and scared way , he was not sure to let her in because he was not trusting or scared from her, then he let her in.
also the professor got killed.
Finally he discovers that she was the killer and she did it because the professor doesn’t want to continue the relation with her.
Now I’m remembering it maybe they were pranking him with the students being dead but then it turned to be real(NOT SURE!)