<Li> Cassidy Freeman as Cady Longmire, Walt's daughter, an attorney who initially works for a local law firm . Later, she works for Jacob Nighthorse, to provide representation to residents on the reservation . She was romantically involved with Branch Connally for a time; later "Zach" Heflin . </Li> <Li> Adam Bartley as Archie "The Ferg" Ferguson, an awkward but hard - working young deputy, who felt unappreciated next to the handsome Branch and detective Vic . His eclectic knowledge and skills have helped solve cases, justifying Walt's hiring him . He continues to feel overlooked, although he is promoted to a more senior deputy following Branch's death . In season 5 he meets Meg, a local nurse . </Li> <Ul> <Li> Louanne Stephens as Ruby: the dispatcher and manager of the sheriff's office (seasons 1--6) </Li> <Li> Zahn McClarnon as Chief Mathias: chief of the Cheyenne reservation's tribal police (seasons 1--6) </Li> <Li> A Martinez as Jacob Nighthorse: a local Cheyenne businessman representing the interests of his people (seasons 1--6) </Li> <Li> Gerald McRaney as Barlow Connally: a wealthy, powerful, local real estate developer and Branch's father (seasons 1--4) </Li> <Li> Peter Weller as Lucian Connally: Branch's uncle and Walt's predecessor as sheriff, now retired (seasons 1--4, 6) </Li> <Li> John Bishop as Bob Barnes: the town drunk who has worked a variety of odd jobs (seasons 1--6) </Li> <Li> Tom Wopat as Sheriff Jim Wilkins of neighboring Cumberland County (seasons 1--6) </Li> <Li> Louis Herthum as Omar: a local hunting guide with expertise in firearms (seasons 1--3, 5) </Li> <Li> Katherine LaNasa as Lizzie Ambrose: a wealthy local woman with whom Walt has a tentative romantic relationship (seasons 1--2) </Li> <Li> Charles S. Dutton as Detective Fales: a detective from Denver investigating the suspicious death of the murderer of Walt's wife (seasons 1--3) </Li> <Li> Derek Phillips as Travis Murphy: a boyhood friend of Branch Connally's who wants to be a sheriff's deputy (seasons 2--6) </Li> <Li> Michael Mosley as Sean Keegan: Vic's husband, who works as a natural gas company executive (seasons 1--3) </Li> <Li> Jeffrey De Serrano as Hector: A Cheyenne ex-boxer who lives on the reservation and is a mercenary - for - hire for Cheyenne seeking justice (seasons 1--3, 6) </Li> <Li> Lee Tergesen as Ed Gorski: an ex-cop from Philadelphia who used to work with Vic (seasons 1--3) </Li> <Li> Noam Jenkins as FBI Agent Towson: a by - the - book agent who is seen by the sheriff's department as a negative force (seasons 2, 5) </Li> <Li> Graham Greene as Malachi Strand: former chief of the tribal police and Nighthorse's chief of security at the casino (seasons 3--6) </Li> <Li> Hank Cheyne as Sam Poteet: a Cheyenne White Warrior and sage, whom Branch kidnaps and tortures (seasons 3--6) </Li> <Li> Scott Michael Campbell as Dr. Weston: a doctor at the regional hospital who occasionally assists in Longmire's investigations (seasons 3--6) </Li> <Li> Josh Cooke as Eamonn O'Neill: a deputy from Cumberland County who fills in briefly after Branch's death (seasons 4--5) </Li> <Li> Barry Sloane as Zachary "Zach" Heflin: hired by Walt as a new deputy (seasons 4--6) </Li> <Li> Ally Walker as Dr. Donna Monaghan: a therapist treating local veterans (seasons 4--5) </Li> <Li> Callum Keith Rennie as Walker Browning: a manager for a regional energy company; Walt suspects him of criminal activity (seasons 4--5) </Li> <Li> Tamara Duarte as Mandy: a young Cheyenne woman hired by Cady Longmire to assist her in the legal - aid office on the Cheyenne reservation (seasons 4--6) </Li> <Li> Mary Wiseman as Meg: a nurse at the local hospital who begins dating Ferg (seasons 5--6) </Li> <Li> Eric Ladin as Mayor Sawyer Crane: the ambitious mayor of Durant (seasons 5--6) </Li> <Li> Brett Rice as Tucker Baggett: close friend of Barlow Connally, organizes a wrongful death lawsuit against Walt for the shooting of Barlow (seasons 5--6) </Li> <Li> Dylan Walsh as Shane Muldoon: leader of the Irish Mafia (seasons 5--6) </Li> </Ul> <Li> Louanne Stephens as Ruby: the dispatcher and manager of the sheriff's office (seasons 1--6) </Li>

Who plays the mayor in longmire season 6