On the 1st September 2015, Lieutenant Joseph 'G.I. Joe' Gliniewicz calls for back up after pursuing three males into the wooded area of Fox Lake. Moments later, Joe is found lying face down after a fatal shooting. Suspicions began to rise surrounding the death of the cop fallen in the line of duty. There were no visible signs of a physical altercation or defensive wounds as well as more unsettling evidence. Find out who Joe was and what happened in this week's episode.