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?

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?