Miguel was Don Eladio Vuente's bodyguard.
Miguel was present at Don Eladio's party along with Eladio himself, Gustavo Fring, Mike Ehrmantraut, Jesse Pinkman, Benicio Fuentes, Gaff, and nine of Eladio's capos. During the celebrations, he relaxed on a chair while mingling with a girl and drinking the Zafiro Añejo tequila that Gus brought as a present to Eladio. Along with one of Eladio's capos, he admired another girl trying to entertain Jesse.
Gus then asked Eladio permission to use his bathroom. Eladio ordered Miguel to escort Gus to the bathroom and to "make sure he doesn't get lost". Miguel showed Gus the bathroom, who then proceeded to vomit the tequila he had drank, which had been poisoned. Miguel died shortly afterwards from having also drank the tequila. ("Salud")