I watched the The Slow Hustle back in November, and knew the case from following the Gun Trace Task Force story back in 2017. I read all the articles and indictments back then. The documentary makes a good pitch, but probably a fundamentally flawed one, shining a light on a single killing, usually ends up with many unknown elements and conjecture, similar to something like The Staircase. Especially one involving a police officer.
Who benefits from his death? The cops were already indicted, and Suiter knew nothing that could indict more officers. No one knew where they were going that day, someone would have to lure them to the scene, shoot him, and disappear. They were just driving around. And if he really was acting like the way he was in We Own This City, riding by his old area, he probably killed himself. That's a lot of long leaps in logic, to get to a fairly unlikely place anyway, that a cop ordered the killing. But, given the BPD reputation and the events around it, of course no one will believe that.