Austin Sigg, 17, was held without bail in this month's kidnapping and death of Ridgeway, 10, and a Memorial Day weekend attack on a female jogger at Ketner Lake in Westminster, The Denver Post reported Wednesday.
Ridgeway disappeared Oct. 5 after leaving her Westminster home for school. Police have said Sigg has confessed and DNA evidence connects him to the crime.
During a court hearing Tuesday, Sigg was told he faces 17 counts, 11 related to the abduction and slaying of Ridgeway, including first-degree murder after deliberation, three counts of felony murder, second-degree kidnapping and robbery.
The Post said Sigg was charged with six counts, including attempted first-degree murder, attempted kidnapping and attempted sexual assault, in his alleged attack on the jogger.
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