The Broken Ear
Corporal Diaz was a colonel for General Alcazar until Alcazar demoted him to corporal, replacing him with Tintin, after Diaz complained to the general that San Theodoros had too many colonels and too few corporals ("The Broken Ear"). In revenge, Diaz engaged in repeated, unsuccessful assassination attempts against Alcazar. Diaz expired in the last attempt when the bomb he planted exploded prematurely. Alcazar had just arrested and sentenced Tintin to death due to faked evidence, and had just promoted Corporal Diaz back to colonel.