|Minor Character: Las Vegas|
|Portrayed By||Mark Valley|
Prior to Boom, Jack Willman had a prior for assault. In Boom, Kristy, his prostitute threatened to leave him to go back to school and he starts arguing with her, which is soon interrupted by Nick Stokes, who had two previous cases involving her, telling Jack to back off. Later after Nick took Kristy home and had an intercourse, Jack strangles her to death with a curtain rope and did a poor job trying to put it back. Later, when O'Riley interviewed him, he tried to say Nick was the one who strangled her, but Catherine Willows finds the rope and his DNA. As Jack is lead to jail, Nick confronts him and Jack reveals Kristy was only going back to school to recruit more girls, but Nick replies that Jack's life is over for 25 years.