Blind Vision (1992)

Blind Vision (1992) William, a lonely mail-room employee, is obsessed with Leanne, a beautiful secretary in his office, who also just happens to live in the apartment opposite his. At home he spies on her with a telephoto-lens camera, and one night he sees her having sex with another co-worker from the office, Greg. Shortly afterwards Greg is murdered, and Leanne begins to suspect that William might have done it.