Question: Joe Lefors was responsible for the 1903 arrest of Thomas Horn for the murder of what man's son?
Sentence (from "Joe Lefors"): He is best known for the arrest of gunman Tom Horn in 1903 for the alleged murder of 14‑year-old sheepherder Willie Nickell, which has since come into question, and it has long been believed that Lefors falsified evidence helping to convict the wrong man for the murder.
Relevant evidence: Yes