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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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