Detailed Instructions: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Q: Passage: Cattle rustlers Robert Hightower, Pedro "Pete" Rocafuerte, and William Kearney rob a bank in the town of Welcome, Arizona, but William is shot in the shoulder and they have to flee into the desert, pursued by a posse led by Sheriff Buck Sweet, who shoots a hole in their water bag (that they do not notice until after all the water has leaked out). They eventually lose their horses in a desert sandstorm and end up walking. Desperate for water, they head for a water hole, which has, however, been destroyed by the misguided efforts of a bumbling tenderfoot, who then chased after his livestock and did not return. 
In a covered wagon left nearby lies the man's wife (Sheriff Sweet's niece), who is about to give birth. With the help of the trio, she has a boy, whom she names Robert William Pedro after her benefactors. Before dying, she extracts a promise from them that they will take care of him. Moved, the three desperadoes try to keep their promise despite the acute lack of water.
William is certain a higher power guided them there and likens their situation to the Three Magi finding the baby Jesus in a manger. He convinces the others to head for the town of New Jerusalem, which lies across a wide expanse of desert. While crossing a salt flat, William dies; later, Pete falls and breaks his leg. He asks Robert to leave him his pistol, for "protection from coyotes." As Robert walks away, he hears a single gunshot.
A:
What is the last name of the person who is shot?