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South Dakota inmate serving life sentence for attempted murder dies in prison

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Garreth Q. Gannon. Courtesy of the South Dakota Department of Corrections

SIOUX FALLS, S.D. — Garreth Q. Gannon, who was serving a life sentence in the South Dakota State Penitentiary in Sioux Falls for attempted murder in Rapid City in 1996, died Wednesday, Oct. 16, after an illness, prison spokesman Michael Winder announced Thursday.

Gannon was 64.

He was sentenced in April 1996 to life in prison for a count of attempted first-degree murder and a count of first-degree robbery as a habitual offender. Gannon apparently never appealed his conviction, according to the state Supreme Court.

According to the Rapid City Journal, Gannon pleaded guilty in April 1996 to the March 1996 shooting of a Rapid City tobacco shop employee.

In court, Gannon agreed he was a career criminal who had spent much of the previous two decades in prison and that he meant to kill the only witness to his crime.

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“Gannon passed away in the infirmary of the Jameson Annex to the South Dakota State Penitentiary Oct. 16,” Winder said in a news release.

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