This was a 70’s move (maybe early 80’s) Opens with a young man in a small kitchen with his mother (or maybe wife?). He’s holding a kitchen knife and somehow the mother accidentally gets pushed into the knife and she dies.

The young man runs from the potential manslaughter charge, and somehow winds up on a boat, a storm comes up and the boat sinks and the man drowns or there might have even been a shark.

The other thing about this movie is there was a very distinctive song, a folk style song, with flutes. It was actually a pretty good song.