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One person is dead following a triple shooting in Tulsa. Police were called to the QuikTrip at 15th and Denver on Monday and found the suspect, an off-duty security guard and a woman who was an innocent bystander suffering from gunshot wounds. Authorities say the suspect, Ryan Mitchell, was arguing with his girlfriend at the store when the off-duty security guard reportedly saw Mitchell pull out a gun while talking to an on-duty security officer. Mitchell died after exchanging gunfire with the security officers, and the incident is under investigation.