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It's from the 1980s I think. It was a group of girls at a party that are killed off then there's one survivor and she is escorted into an ambulance, but the killer goes in the back with her, and the doors close. She is screaming "No!No!" then the movie ends. I'm pretty sure it was a female killer but I can't be entirely sure. If someone could help me find out what movie this is I would really appreciate it.