MURFREESBORO (AP) – A Rutherford County Sheriff’s deputy has resigned amid a Murfreesboro Police investigation of him.Deputy Pat Garrett had been placed on leave Monday after the boyfriend of a Murfreesboro taxi driver said Garrett put a gun to his head during a cab ride.Sheriff Robert Arnold confirmed Garrett’s resignation Wednesday afternoon.Jeffrey Fryer said he was riding with his cabbie girlfriend, Lisa Jared, when she was called to a bar to pick up Garrett early Aug. 14.Fryer told WSMV-TV that when the cab reached Garrett’s home, he tried to pay with a credit card and his department ID card fell into Jared’s lap. She asked him where his gun was and Fryer said Garrett put the weapon to the side of his head.• • • • •PIKEVILLE (AP) — A prosecutor said a woman arrested in the slayings of two widow sisters in Bledsoe County is a daughter-in-law of one of the victims.District Attorney Mike Taylor said 82-year-old Elizabeth Brown and 79-year-old Billie Sue Blaylock had apparently changed their wills about two weeks before they were fatally shot and that could be a possible factor.Taylor said 47-year-old Brenda K. Brown of Pikeville was arrested Wednesday on murder charges. He said TBI agents executed a search warrant and recovered a handgun “they feel in fact is the murder weapon.”Brown is a daughter-in-law of Elizabeth Brown.