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SIOUX FALLS, S.D. (CBSMiami/AP) —  A Florida man charged with killing his girlfriend in 1989 plead not guilty to first degree murder on Tuesday.

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Kim Aune appeared in court in Minnehaha County for the first time. The 57-year-old man was indicted in April in South Dakota and arrested in Florida.

Aune is accused of shooting his girlfriend at the time, 21-year-old Kimberly Eidsness, on Nov. 13, 1989, at their home east of Sioux Falls.

State’s Attorney Aaron McGowan has said Aune, who was 31 at the time, was living with Eidness when she died. He reported the shooting to police, who initially did not consider it to be a murder case.

Authorities have declined to release what new details made them re-open the case.

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Aune’s appearance before Judge Joni Cutler was brief, the Argus Leader reported. Neither McGowan nor Public Defender Traci Smith made arguments.

Aune will remain in the Minnehaha County Jail on a $1 million bond.

If convicted, he faces a mandatory life sentence or the death penalty.

His trial is scheduled to begin Sept. 8th.

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