The 33-year-old had one season with the men of Gwent whilst also appearing for premiership sides Bedwas and Cross Keys.
The Italian international made 15 appearances for the Dragons during last season.
Newport Gwent Dragons chief executive Gareth Davies commented: “I would like to thank Kris for his contribution to the Dragons over the past 12 months . He has proved himself to be a highly professional individual, both on and off the field, and we wish Kris and his family the very best with their move back to Australia."
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