Detective thriller with climax in a diner

1990s North American production. TV movie or at most straight-to-video, definitely not a theatrical release. The main character is a tall, white male detective in his 40s with prematurely grey hair. His detective partner is a black male also in his 40s. Before the climax, the MC finds his black partner dead. The next part I'm sure of: the climax occurs in an American diner. The detective realizes the villain is sitting 2 tables behind him, because the villain is wearing in-ear headphones which I think were connected to a cassette tape that played into a mobile phone to confuse the police about his location. The cop turns suddenly and they both draw guns; the villain is shot a couple of times and dies. The overall vibe reminded me of the Dr. Zito episodes in MacGyver, wasn't too violent.