<Li> Mekhi Phifer as Ben Reynolds, an FBI Agent who is assigned to and assists the Lightman Group in their investigations, offering armed assistance and practical insights . Reynolds doesn't always agree with Lightman's ways but stands behind him most of the time . (Recurring--season 1, regular--season 2) </Li> <Ul> <Li> Jennifer Beals as Zoe Landau, Cal Lightman's ex-wife and Emily's mother, occupied as an Assistant Attorney General . While engaged to another man, she also engaged in a tryst with Lightman, after he helped her in a case . (Seasons 1 & 2) </Li> <Li> Monique Gabriela Curnen as Detective Sharon Wallowski, a police officer who assists Lightman . She also engages in a romantic relationship with Cal Lightman, but ends it once Lightman finds out the truth about her past as a dirty cop . (Season 3) </Li> <Li> Tim Guinee as Alec Foster, Gillian Foster's ex-husband . He works at the United States Department of State and is a recovering cocaine addict . Throughout the series it was heavily hinted that he was having an extramarital affair until it was revealed that the woman was his CA sponsor . He and Gillian divorced . (Season 1 only) </Li> <Li> Sean Patrick Thomas as Special Agent Karl Dupree . Dupree initially assisted the Lightman group on a case involving a controversial South Korean ambassador who is presumed to be an assassination target at his son's state wedding . Torres and Dupree are romantically involved later in season one . He also defends Torres against Loker when he divulged sensitive information to the SEC while working on a case . (Season 1 only) </Li> <Li> Brandon Jones as Liam, Emily Lightman's boyfriend, a high school jock who is not intimidated by Cal Lightman . Emily breaks up with him because he does not believe in sex before marriage . (Season 3 only) </Li> </Ul> <Li> Jennifer Beals as Zoe Landau, Cal Lightman's ex-wife and Emily's mother, occupied as an Assistant Attorney General . While engaged to another man, she also engaged in a tryst with Lightman, after he helped her in a case . (Seasons 1 & 2) </Li> <Li> Monique Gabriela Curnen as Detective Sharon Wallowski, a police officer who assists Lightman . She also engages in a romantic relationship with Cal Lightman, but ends it once Lightman finds out the truth about her past as a dirty cop . (Season 3) </Li>

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