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A 17-year-old South Dakota boy will remain in juvenile detention under a $1 million bond while he faces second-degree murder charges in adult court after the body of a teen girl believed to be missing from Wyoming was found Monday in the basement of his home.

Michael Gavin Campbell made his initial appearance before 4th Circuit Judge Kevin Krull on Wednesday morning at the Meade County Courthouse in Sturgis, South Dakota.

Campbell, his straight brown hair extending past his collar, wearing handcuffs and dark juvenile detention togs with the size 2X in white emblazoned on the back, answered in a quiet voice “Yes, your honor,” as the judge asked him if he understood the charges and the potential punishment of life in prison.

Campbell, of Sturgis, is charged in the death of the girl, whom authorities believe to be Shayna Ritthaler, a 16-year-old who went missing from Moorcroft on Oct. 3.

Krull agreed with acting Meade County State’s Attorney Michele Bordewyk’s request for that documents in the case including the probable cause complaint be sealed.

But in pushing for no bond for Campbell, Bordewyk cited a violent act that led to the girl’s death.