DENVER
10/30/2012 01:46 pm ET Updated Oct 30, 2012

Austin Reed Sigg Faces 17 Charges As An Adult For Abduction And Murder Of Jessica Ridgeway

The 17-year-old who allegedly confessed to the murder and abduction of 10-year-old Jessica Ridgeway was formally charged as an adult in Jefferson County on Tuesday morning.

According to a report by 7News, Sigg was led into the courtroom in shackles and was accompanied by 11 guards.

Sigg faces 17 charges, including four counts of first degree murder, two counts of second degree kidnapping, sexual assault on a child, robbery and others related to the attempted abduction and sexual assault of a female jogger at Ketner Lake.

There are 11 charges related to Jessica's case and six related to the incident at Ketner Lake.

Though Sigg is now being charged as an adult, prosecutors will still not be able to seek the death penalty against him because of the Supreme Court ruling in Roper v. Simmons (2005) that prohibit it for those under the age of 18 at the time of their crimes. Likewise, the Supreme Court's ruling in Miller v. Alabama prohibits juveniles receiving life sentences without the possibility for parole.

Adults face mandatory life in prison without parole for a murder conviction.

Sigg therefore faces up to 40 years in prison before becoming eligible for parole.

He's allegedly already confessed to the crime and Jefferson County District Attorney Scott Storey has already cited "overwhelming evidence" against the teen, including a DNA match.

Jessica disappeared on Oct. 5th during her short walk to school. Just five days later, her body was found dismembered in Pattridge Park.

"The amount of violence — the pathology in that — is remarkable at any age, but especially for a teen," retired FBI profiler Gregg McCrary told the Denver Post, noting that it's especially rare for teens to exhibit such violence.

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