Sigg, who lived about one mile from Ridgeway family, was 17 at the time of the killing and was charged as an adult.

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Colorado state courts spokesman Rob McCallum said that Sigg, who faces 18 criminal counts, was arraigned and pleaded not guilty in court Friday.

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Austin Sigg is accused of strangling young Jessica, dismembering her and placing some of her body parts in a crawlspace under his family's home.

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Others included Guan Yi, a wealthy Beijing-based collector, and Uli Sigg, a Swiss businessman and former ambassador to China, whose collection of contemporary Chinese art is now on show in Bern.

ECONOMIST: Two leading art fairs are showcasing new art from China

Mr Sigg, who has travelled around much of China over the past quarter-century collecting its contemporary art, has yet to be convinced by all this talk of a boom in museums.

ECONOMIST: Two leading art fairs are showcasing new art from China

In addition to murder, sexual assault, kidnapping and other charges tied to Jessica's case, Sigg has also been charged with attempting to kidnap, sexually assault and kill a female jogger last May.

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