a few months after michael gill was released on parole. >> coming up, our producer follows a trail of blood that leads to one of the most shocking scenes ever shown on lockup. >> we got a cut up here. >>> when our crews are filming inside high security prisons they know that violence can erupt at any moment. while they are prepared for it, when it happens it can still be shocking. >> during our extended stay shoot inside indiana state prison we walked into one of the bloodiest encounters in lockup history. >> we were filming in one of the housing units and we heard a call come over the radio instantly all staff members started running. we picked up our gear and ran with them. >> what is it? >> a fight. >> there was just a chaotic scene. by the time we got there they were already pulling people out coming back from chow. and they were trying to find a victim of what we thought at the time was a fight. >> i don't know who it involved. >> i don't know. no. i told these guys to hold up. >> blood all over here. where is the guy that got stabbed? >> immediately it became a large crime scene

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