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DAKOTA CITY, Neb. (AP) — A man accused of fatally shooting his wife outside a northeast Nebraska police station intends to use an insanity defense.

Dakota County District Court records say the attorney for 41-year-old Bei Sheng Chen filed notice Wednesday of his intention. A pretrial conference is scheduled Friday. In December a judge approved Chen’s request to undergo psychiatric evaluation.

Authorities say Chen shot 33-year-old Mei Huang on Sept. 6 in the parking lot of the South Sioux City police station. She died hours later at a Sioux City, Iowa, hospital. He’s pleaded not guilty to first-degree murder and other charges.