Soda Cracker aka The Kill Reflex 1989

A cop called 'Soda Cracker' partner is killed in a mysterious assassination. Soda Cracker is convinced that the murder was committed by his old enemy, Ivan Moss. Despite threats from the mob and from the police department, he vows to continue his mission to find the persons responsible for the assassination. His new partner, a woman falls in love with him during their investigations. 'Soda Cracker' also has to deal with the fact that many of the police officers on the squad may be corrupt, and tries to break down the criminal network whilst finding evidence against Ivan Moss.