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A Santa Fe County sheriff’s deputy has been charged in the murder of a fellow deputy.Police said Jeremy Martin, 29, was shot and killed overnight in a Las Cruces hotel.Martin and Tai Chan, 27, were staying the night at Hotel Encanto after extraditing a prisoner to Stafford, Arizona. Las Cruces police said the two visited a Dublin’s Street Pub Monday night, where they had an argument.Police said they believe the deputies were drinking.The two returned to the hotel around midnight. Police said the argument between the two escalated and Chan fired several gunshots at Martin. Martin was attempting to flee to an elevator at the time he was shot, according to police.Police said Martin was shot several times in the back. Witnesses said they heard at least six shots.Officers found Martin in the hotel lobby. He was rushed to Mountain View Regional Medical Center where he died.A K-9 officer found Chan unarmed in a hotel stairwell. He was taken into police custody.Hotel staffers were taken across the street, according to witnesses.Police have not identified the shooting suspect, but Santa Fe attorney John Day said the deputy in custody is Chan and he will be representing him.Chan is expected to be arraigned in Las Cruces Wednesday. It is unclear whether he'll be placed on administrative leave.Santa Fe County Sheriff Robert Garcia held a news conference Tuesday morning to talk about the shooting. He fought back tears through much of his remarks.Full News Conference: Santa Fe sheriff speaks on shooting“This has been a major shock to this agency and to my staff. In my 34-year career, I would never think and hoped that I would never receive that kind of phone call,” Garcia said. “I never thought it would be two from within my own agency.”The sheriff called Martin a great, hardworking deputy. He'd been with the office for about 2 1/2 years.Garcia said he spoke with Martin’s widow Tuesday morning. Martin leaves behind three young children, ages 4, 9 and 11. The couple recently discovered she was pregnant with a fourth child.“Please keep her and her family within your prayers,” Garcia said. The sheriff said the department has taken the loss very hard. “Any time your phone rings at 1, 1:30, 2 in the morning, you know something has taken place, but this has been a major impact and a major shock to all my staff," Garcia said. “We do have a very strong law enforcement family here at the Sheriff’s Office and I’m sure it will take a long time before we get over some of this ... We're here for each other as we grieve through this process.”To help with the grieving process, Santa Fe and state police are picking up extra calls for service. Garcia said deputies are allowed to consume alcohol during overnight trips as long as they're not on duty. He also said they have to follow a code of conduct at all times.Garcia said the two had a great working relationship and isn't aware of any problems between them.According to our media partners at the Albuquerque Journal, Chan was recently commended by the department for returning a stolen safe and photos to a family whose home had been burglarized. He's worked with the office for about three years.Chan is the nephew of Santa Fe County Commissioner Robert Anaya.Martin is the first Santa Fe County deputy killed in 34 years.Deputy Sheriff Leopoldo Gurule was shot and killed after responding to a domestic dispute. He was killed when a man with a rifle came out of a home and opened fire before taking his own life, according to the New Mexico Law Enforcement Memorial website. A city park and detention center in the county were named after Gurule.KOAT Action 7 News is following this story and will update this as soon as more information is available.MOBILE USERS: Tap here for videoPHOTOS: Deputy shot, killed by fellow deputy