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On Feb. 12, deputies responded to the 3400 block of Grinnell Road after a man called 911 and said he shot two people who came onto his property and threatened to kill him and his wife.
The incident began when a man, later identified as Robert Sanders, was shot when he approached a vehicle as it pulled into the driveway, said Sheriff Gene Fischer.
He said the Duncans were inside the vehicle and Robert Duncan exchanged gunfire with Robert Sanders, who was shot and killed.
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Robert Duncan then shot Cheryl Sanders, who drove up to the scene shortly after the first shooting. She was also armed with a gun, Fischer said.