A suspended detective confronts his past investigating an unsolved murder believing it?s connected to his partner?s killing that forces him to face himself, to his end or a cathartic answer for both murders and himself.

This reads like a pitch, still unsure what the movie/story is.

"A suspended cop start privately investigating a cold case murder believing it is linked to his partners death but....," insert obstacles.

Why has the detective been suspended? ?Is there a causal relationship between his suspension and the unsolved homicide and/or the murder of his friend?

"When his partner is murdered, a suspended detective investigates a contentious unsolved homiside he believes is related to his friends killing, in spite threats from his chief and the Mayor to drop the investigation."