yep, he was killed in the Battle of Cerro Corá the last battle of the Paraguayan WarDidn't the leader of Paraguay during the War of the Triple Alliance die in battle against forces from Brazil, Argentina and Uruguay?
López was surrounded by the Brazilians and, after refusing to surrender, he was speared by Francisco Lacerda, penetrating into the woods shortly thereafter. General Câmara followed him and found him near the Aquibadán stream, where he again refused to surrender, being shot in the heart.