"The only person that knew where my family was and now he's dead. I had every chance to kill him. But I couldn't, because he had my family."
Joe Muller is a notable character who was forced by Dale Schrader to assist in his killing spree in Retaliation.
Background
Joe worked as an undercover police officer in New York. In his personal life, he was married to a woman named Molly and had two sons with her. He went undercover in the bank robbery world in a stint to capture Dale Schrader, who robbed fourteen banks from 1994 to 1997. Little details were revealed about the case, but Joe somehow became associated with Dale. He was eventually able to provide evidence that helped put Dale away after he was sold out by fellow bank robber Dan Otey. Afterwards, Joe moved on with his life, unaware that Dale deduced he was a cop and that he was plotting a revenge scheme against him. Things came to a head on December 14, 2009, when Dale suddenly approached him at a hardware store parking lot, showing him a photo of his family being held captive and claiming to know where they are. He forced him to drive over to a poor neighborhood, where Joe witnessed him murdering a crack addict named Stacy Ryan. He then reluctantly drove Dale to an empty field, where he disposed of Stacy's body. Next, the two engineered a scheme to break Dale out of police custody in case he was captured while abducting his daughter Jenny.
Retaliation
See section on the Dale Schrader article