Older man kills woman and calls cops!

I remember seeing a movie when I was younger. Movie was be between years 2003-2010, it was in color, somewhere in the premium channel:. HBO/SHOWTIME/STARZ. Movie was in English.

The main character was an older man who had secret cameras inside his house to monitor it. In the end he ends up killing a woman (might of been girlfriend or wife), then proceeds to call 911. I think he tells them he killed his wife, or maybe just tells them his wife is dead. I never got to see it from the beginning when I was a kid, now I NEED TO SEE IT! Otherwise I will not rest in peace 🙂

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