When Did Carlos Feller Die?

Kalman Felberbaum was an operatic bass singer who enjoyed an international career using the professional/stage name Carlos Feller. Of Polish descent, he grew up in Argentina, and made a career in Germany, based for decades at the Cologne Opera. He specialized in comedic supporting roles, especially bad-guys and strange, quirky characters. His signature role was Don Alfonso in Mozart's Così fan tutte.