I'm trying to remember the name of a movie that had about four-five teenagers/college students being killed off one by one by the alcoholic dad/step dad perhaps. One scene involved a girl being killed by a large shark hook type thing as she was being held down on a work bench. It seems it was set at a beach/summer house. I also remember seeing a harpoon/gun type thing that was hanging on the wall and then missing. I would have seen this at some point during the eighties, but cannot come up with a title. Thanks for your help.

I Know What You Did Last Summer?

No. That's not the one. It was prior to that. But thanks though!

The Mutilator (1985)

OMG!! That's it. Thank you so much! By the way, if you are in to b-movies, that one is good! Thanks again.

You're very welcome. I've come across other people asking about this film, I'll have to check it out.