Other characters included Nathan Brubaker, played by Michael Whaley, a former defense attorney turned detective. He appeared throughout season one. Shiek Mahmoud-Bey played Marcus Payton in season two who was an FBI agent skeptical of Sam's methods. A Martinez appeared occasionally in the first and second seasons playing Nick "Coop" Cooper, an ATF bomb disposal expert, who was Sam Waters love interest. Agent Cooper was later murdered by Jack. (Martínez had previously worked with Walker on the NBC daytime serial "Santa Barbara".) Heather McComb appeared frequently in the first and second seasons as Frances Malone, the wayward and rebellious teenage daughter of Bailey Malone. Traci Lords appeared throughout the second season as a violent ex-convict named Sharon Lesher, who became the serial killer "Jill of All Trades" after she was recruited by Jack.