Body of Evidence (1993) online

A millionaire is found dead of heart failure handcuffed to the bed with a home video tape of him and his lover. When cocaine is found in his system, and his will leaves $8 million to his lover, they arrest her on suspicion of murder. Her lawyer succumbs to her charms, and he begins a torrid and kinky affair with her. As new evidence turns up during trial, he begins to wonder if he's defending a murderer.