There was a scene in a movie on one of the networks listed that showed a swimmer who was handcuffed to a pool ladder while underwater and drowned just inches from the top of the water surface. I want to say it was HBO, but I can’t remember for sure. Think the movie may have had different “episodes” within it, kind of like Creepshow but they all involved murders.
The Killing Hour (The Clairvoyant) (1982)