Molten gold was poured down his throat until his bowels burst.
--F R W van de Goot, R L ten Berge, and R Vos, J. of Clinical Pathology, v56(2), Feb 2003. Describes an experiment on a bovine carcass replicating a 1599 Spanish governor in early colonial Ecuador that suffered this fate. http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1769869&blobtype=pdf