Andrew (The Walking Dead)

The Walking Dead
Before the apocalypse Andrew was a convicted criminal in West Georgia Correctional Facility. When the outbreak began he along with Tomas, Axel, Oscar, and Big Tiny were locked in the cafeteria by a guard with one gun. 10 months later they were found by Rick's group. He sided with Tomas when he stood up to Rick and pleaded with the group to save Big Tiny who later died. After Tomas and Rick fought Rick killed Tomas and Andrew tried to attack Rick but failed. Rick chased him out to the court yard (which was filled with Walkers) and locked him outside. Andrew tried to escape but couldn't re-enter the prison and was presumed dead.

In the next episode a shadowy figure is shown placing a dead deer at the entrance of the prison which draws hundreds of Walkers to the prison. The figure is later shown activating the prison alarms which draws in more Walkers that actually get into the prison and attack the group. This causes the death of TDog and Rick's wife. Rick, Oscar, and Daryl go into the control room to turn it off. While Daryl holds the door shut Rick and Oscar go to turn off the machine. Andrew is revealed to be the figure and attacks Rick with an axe. He and Rick disarm each other and Oscar gets his gun. Andrew tries to get him to kill Rick, which would give them the opportunity to retake the prison. Oscar however instead kills Andrew and proves himself to the group.