<Ul> <Li> Thomas Lennon as Leo Getz , a comedic ambulance - chasing lawyer who once worked in the District Attorney 's office before being fired . He befriends Murtaugh ( and to a lesser extent , Riggs ) after he witnesses a client 's murder , and is put under their protection . His friendship with the duo is strengthened in the second - season episode `` Let it Ride '' where he works with them again and Murtaugh assures Leo that they do n't have to be on a case to be friends . Getz is partially inspired by the character of the same name played by Joe Pesci in the film series . </Li> <Li> Hilarie Burton as Karen Palmer ( seasons 1 -- 2 ) , a DEA agent who sometimes works with Riggs and Murtaugh on drug trafficking cases , and is also Riggs ' love interest . The two break up early in season 2 . </Li> <Li> Floriana Lima as Miranda Riggs ( née Delgado ) ( seasons 1 -- 2 ) , Det . Riggs ' late wife , who is seen in flashbacks . Originally from the Los Angeles area , she moved to Texas when she married Riggs , and after her death , he moved to LA and joined the LAPD . The character is based on Victoria Riggs from the film series , although she was never seen as she had already died before the events of the first film . </Li> <Li> Richard Cabral as Detective Alejandro `` Alex '' Cruz ( season 1 ) , formerly an undercover officer with the LAPD 's Gang Division who once worked at the Robbery - Homicide Division . </Li> <Li> Tony Plana as Ronnie Delgado ( seasons 1 -- 2 ) , the Los Angeles City Attorney and Det . Riggs ' father - in - law . He is stabbed in prison in the Season 2 episode `` Diggin ' Up Dirt '' , and dies in the hospital . </Li> <Li> Andrew Patrick Ralston as Jim McNeile , a dentist and neighbor of the Murtaughs . </Li> <Li> Michelle Hurd as Gina Santos ( season 2 ) , a police big shot who arrives to take control of the division as chief , superseding the authority of Captain Avery . She and Murtaugh had previously partnered as detectives on a stakeout . </Li> <Li> Andrew Creer as Detective Zach Bowman ( season 2 ) , a young detective who starts working at the precinct . He is soon partnered with Bailey . Leo Getz condescendingly calls them `` The B - team '' , which the naïve Bowman thinks is because their last names both start with `` B '' . </Li> <Li> Kristen Gutoskie as Molly Hendricks ( season 2 ) , Riggs ' childhood friend and the ex-wife of his old best friend Jake , who has been in and out of prison . Riggs and Molly have a brief relationship that Riggs ends when he sees his work is putting Molly and her son in danger . They later are able to reconcile . </Li> <Li> Rex Linn as Nathan Riggs ( season 2 ) , Martin Riggs ' abusive father . </Li> <Li> Chase Mangum as Young Martin Riggs ( season 2 ) </Li> <Li> Sophia Woodward as Young Molly Hendricks ( season 2 ) </Li> <Li> Duncan Joiner as Ben ( season 2 ) , Molly 's son via her ex-husband Jake . </Li> <Li> Peter Coventry Smith as Garrett Riggs ( season 2 ) , Riggs ' half - brother . </Li> </Ul>
<Ul> <Li> Thomas Lennon as Leo Getz , a comedic ambulance - chasing lawyer who once worked in the District Attorney 's office before being fired . He befriends Murtaugh ( and to a lesser extent , Riggs ) after he witnesses a client 's murder , and is put under their protection . His friendship with the duo is strengthened in the second - season episode `` Let it Ride '' where he works with them again and Murtaugh assures Leo that they do n't have to be on a case to be friends . Getz is partially inspired by the character of the same name played by Joe Pesci in the film series . </Li> <Li> Hilarie Burton as Karen Palmer ( seasons 1 -- 2 ) , a DEA agent who sometimes works with Riggs and Murtaugh on drug trafficking cases , and is also Riggs ' love interest . The two break up early in season 2 . </Li> <Li> Floriana Lima as Miranda Riggs ( née Delgado ) ( seasons 1 -- 2 ) , Det . Riggs ' late wife , who is seen in flashbacks . Originally from the Los Angeles area , she moved to Texas when she married Riggs , and after her death , he moved to LA and joined the LAPD . The character is based on Victoria Riggs from the film series , although she was never seen as she had already died before the events of the first film . </Li> <Li> Richard Cabral as Detective Alejandro `` Alex '' Cruz ( season 1 ) , formerly an undercover officer with the LAPD 's Gang Division who once worked at the Robbery - Homicide Division . </Li> <Li> Tony Plana as Ronnie Delgado ( seasons 1 -- 2 ) , the Los Angeles City Attorney and Det . Riggs ' father - in - law . He is stabbed in prison in the Season 2 episode `` Diggin ' Up Dirt '' , and dies in the hospital . </Li> <Li> Andrew Patrick Ralston as Jim McNeile , a dentist and neighbor of the Murtaughs . </Li> <Li> Michelle Hurd as Gina Santos ( season 2 ) , a police big shot who arrives to take control of the division as chief , superseding the authority of Captain Avery . She and Murtaugh had previously partnered as detectives on a stakeout . </Li> <Li> Andrew Creer as Detective Zach Bowman ( season 2 ) , a young detective who starts working at the precinct . He is soon partnered with Bailey . Leo Getz condescendingly calls them `` The B - team '' , which the naïve Bowman thinks is because their last names both start with `` B '' . </Li> <Li> Kristen Gutoskie as Molly Hendricks ( season 2 ) , Riggs ' childhood friend and the ex-wife of his old best friend Jake , who has been in and out of prison . Riggs and Molly have a brief relationship that Riggs ends when he sees his work is putting Molly and her son in danger . They later are able to reconcile . </Li> <Li> Rex Linn as Nathan Riggs ( season 2 ) , Martin Riggs ' abusive father . </Li> <Li> Chase Mangum as Young Martin Riggs ( season 2 ) </Li> <Li> Sophia Woodward as Young Molly Hendricks ( season 2 ) </Li> <Li> Duncan Joiner as Ben ( season 2 ) , Molly 's son via her ex-husband Jake . </Li> <Li> Peter Coventry Smith as Garrett Riggs ( season 2 ) , Riggs ' half - brother . </Li> </Ul>
who plays riggs father on lethal weapon tv show
who plays riggs father on lethal weapon tv show
Rex Linn
Rex Linn