Thriller from 90s

I remember watching a film on tv in the late 90s to early 2000s. A guy was living with a married couple. He was controlling and treated the house like his own. At one point he had sex in the couples swimming pool and informed the wife “I think she killed my ****”. The film ended with him in the couples swimming pool, him threatening to shoot the wife, and her killing him by kicking an electric light into the pool. Anyone know the movie?

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