The doctor was a wealthy Spanish doctor from Tenerife, Canary Islands, in 1867. He did not have much concern for the problems of those around him. He primarily cared about money and the upkeep of his possessions. Ricardo implored him to help save his wife Isabella's life. However, the doctor refused to ride a half day in the rain to El Socorro but was willing to sell Ricardo expensive medicine. Upon being presented a nominal sum of money and a "worthless" cross, the doctor refused to give Ricardo the medicine. Ricardo grabbed at the medicine container and, amidst a struggle for the medicine, Ricardo pushed the doctor. The doctor fell and hit his head against a table, causing him to bleed profusely and subsequently die.
The casting call described hm as "[DOCTOR] Latino, 40s-50s, fluent in Spanish. Sophisticated, wealthy, and a somewhat mercenary upper-class doctor who has an imperious bedside manner but knows his stuff..."
He died in much the same way that Kelvin Inman died (accidentally, hit back of head, bled out, culprit took something from the victim and sprinted away from the scene of the crime).