Who was the Aztec king kidnapped and killed by the Spanish?

The Aztec king kidnapped and killed by the Spanish was Moctezuma II. He was taken captive by Hernán Cortés in 1519 during the Spanish conquest of the Aztec Empire. Moctezuma's death occurred in 1520, under circumstances that remain debated, but it was a pivotal moment in the collapse of the Aztec civilization. His capture and subsequent death symbolized the devastating impact of European colonization on indigenous societies.