70s/80s thriller with man murdered in indoor swimming pool by ankle tied to the pool stairs after…

…lights switched off

I saw this American? suspense movie on Dutch TV about 30 years ago. I think it was  about a serial killer. I remember particularly that a man got killed in the movie when he went for an evening swim in his indoor pool, and while swimming under water the murderer switched the lights off and tied his ankle? under water to the pools’s stairs. I guess the movie was from the late seventies or early eighties. Thanks a lot for your assistance!

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