Out of Sight/Missing Piece

After a night out with friends a college students prepares to go home as he is stabbed and killed. Once on scene detectives realize the violence in the area is growing, they come across a man being attacked. Could one of these men be the killer? Three teen boys have an argument, later one of them is shot in a backyard. Detectives set out to find out if these are friends or foe.

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S08E11 - Shattered Dreams/Left to Die