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A search of Mr. Mebane’s mother’s home in Waldorf turned up a 9 mm handgun, Detective Tyler testified. Charles County sheriff’s officials said ballistics tests linked the gun to the Oct. 26 shooting of a married couple who were walking on a footpath in the Hampshire neighborhood in Waldorf. The woman, Teresa Ann Bass, 40, was killed, and her husband is recovering. Court records indicate Mr. Mebane lived about a mile from that footpath.

It is unclear whether police will be able to link the gun they recovered from Mr. Mebane’s Charles County home to the shooting in the District, since the cab caught fire, destroying some evidence. Detective Tyler testified that investigators are still working to analyze what they think is a bullet fragment that was recovered from the cab.

Defense lawyer Jason Downs asked that Ms. Bury’s preliminary hearing be postponed, as he had just received additional information in her case. He did not elaborate on the nature of that information. The preliminary hearing was rescheduled for Dec. 17, when Mr. Mebane will also have his next status hearing.