One week before the long-awaited match-up, on June 19, 1976, Valdez's brother was murdered during a barroom fight in Colombia. Already in Monte Carlo for the fight, Valdez wanted to pull out of it to join his family in mourning. But he was contractually bound to fight Monzon, so he had to stay in Europe, and on June 26, Valdez, who to many observers seemed rather uninterested, lost in the unification bout to Monzon in a 15-round unanimous decision. Valdez won two more fights after returning to Colombia.