i tuned in about half way through and it only just much sense, manning killed himself (the black officer) but then it turned out that he hadn't really killed himself he'd been murdered too. The original killing (of michael) had been done by the artist woman's husband, he couldn't live with the guilt becuase they actually weren't having an affair and killed himself too. Then from what i understand, manning/alex (the chief man's son) and this other police cadet (a tall one) had ALL killed Jason and made it look like a copy cat but it wasn't very good. BAsically it turned out that alex had killed manning then as well and made it look like suicide but i don't know why, he admitted it and said he'd acted alone so give the tall PC another chance.