The Pinkerton files tell a far more complicated story than the one most people know. For decades, the standard version held that Butch Cassidy and the Sundance Kid reached San Vicente, Bolivia, in November 1908, got trapped after a payroll robbery, and died there. But the archival record, now held at the Library of Congress after a 2000 donation, suggests investigators kept treating Cassidy like an open case much later than that clean ending implies. The archive contains a complete paper trail on Cassidy and the Wild Bunch, and the file dates alone complicate the timeline.
Wild Bunch correspondence runs from 1902 to 1915, and then again from 1921 to 1924. Cassidy’s own correspondence file runs from 1899 to 1914, with another entry in 1921. Reward notices and wanted posters date from 1901 to 1907, alongside reports and later notes. For most of the 20th century, this material was either difficult to reach or known only in fragments, which allowed the older popular story decades to harden into something much cleaner than the underlying documents suggested.
The pursuit itself was part of a modern information machine. By the time Cassidy became famous, the Pinkerton agency had over 2,000 full-time agents and tens of thousands of informants, operating across state lines faster than many local sheriffs could. Circulars, photographs, aliases, reward notices, letters, informants, and cross-referenced files all mattered in the chase. Cassidy, born Robert Leroy Parker in 1866, came out of ranch country, hideouts, and rough border spaces, but the Pinkertons represented the paper trail of the new century.
Once the agency fixed a suspect’s face, aliases, associates, and habits onto paper, the chase could continue even when the subject vanished over a border. The gang’s rise was gradual. Cassidy’s path ran through rustling, small-scale crime, prison time in Wyoming, and a return to organized robbery after his release in 1896. By June1899, the gang pulled off the Wilcox train robbery in Wyoming, and PBS notes that Pinkerton detectives were already in the field within 24 hours.
A year later, the Winnemucca bank robbery helped push the gang toward Fort Worth, Texas, where they made a critical mistake. The famous Fort Worth portrait from 1900 showed five Wild Bunch members dressed far better than expected. Pinkerton itself called it the “bad luck photo” because it turned rumor into identification. There is debate over exactly how investigators obtained the image.
An older Library of Congress exhibit repeated the version that a law officer recognized the men where the photograph was displayed. More recent research argues that Fort Worth detective Charles Siringo spotted the image in photographer John Swartz’s waiting room, connected the faces to known criminals, and wired the Pinkertons in Denver. What is not disputed is the result. By May15, 1901, Pinkerton had issued a circular using cropped images and descriptions, and those circulars spread far beyond one state.
Another study found nine different Wild Bunch circulars prepared between 1900 and 1907, including one in Argentina. By August1904, Pinkerton later said only Cassidy and Sundance were still at large. Newspapers helped spread the legibility further, turning one studio sitting into national outlaw publicity. South America was not an escape from that system.
In February1901, Cassidy, Harry Longabaugh, and Etta Place sailed from New York to Argentina, settling in Patagonia, where they bought land and built a four-room ranch house. For a brief stretch, that looked like a practical attempt at reinvention, but the Pinkerton network followed. PBS records that in the winter of1903, informants in Pennsylvania intercepted a letter Sundance sent to his family, blowing the group’s cover. Pinkerton later circulated notices in South America.
The outlaws moved into a larger version of the system, where aliases, borders, and rumors multiplied right along with them. The traditional account of the end places two English-speaking bandits in San Vicente, Bolivia, in early November1908, after robbing a payroll. But HistoryNet notes that no one ever positively identified the dead men as Cassidy and Longabaugh before their burial, and no photographs of the bodies were taken. The inquest evidence was thin enough that rumors took off almost immediately and stayed alive for decades.
In July1909, Frank D. Aller wrote the American legation in La Paz asking for confirmation and death certificates for two Americans reportedly killed at San Vicente. In late1910, the Bolivian government sent back a summary of the inquest and death certificates for two men whose names were still unknown. One witness had only seen the masked robbers’ eyes.
The paperwork effectively said: here are two dead unknowns whom many suspected. The Pinkertons did not instantly accept San Vicente as the end. According to HistoryNet, William A. Pinkerton had heard about the Bolivian shootout before the 1913 arrest of a suspected Butch in La Paz and dismissed the San Vicente story as fake.
In 1913, a Missouri carpenter named Francis M. Lowe was detained in La Paz because police suspected he might be George Parker. He proved he was the wrong man, but the episode showed authorities treating the question as open. Even more striking is a 1921 statement attributed to William Pinkerton, who reportedly told an agent the Sundance had been jailed in Peru for an attempted bank robbery, while Butch had gotten away and was supposed to have returned to Argentina.
The agency was still thinking in terms of movement, escape, and renewed criminal activity, not closed graves. The Library of Congress finding aid makes the continuation concrete. Wild Bunch gang correspondence is listed as 1902 to 1915, then 1921 to 1924. Cassidy’s correspondence is listed as 1899 to 1914 and 1921.
Sundance’s correspondence runs from 1900 to 1911, with reports from 1901 to 1902 and again 1909 to 1911. Etta Place has her own file entries for 1901, 1906, 1940, and undated material. The archive separates gang files, individual files, crime files, photographs, correspondence, reports, and reward material. Some late dates are retrospective essays or organizational material, but when combined with the 1913 mistaken identity case and the 1921 Peru rumor, the picture becomes hard to ignore: the manhunt faded in layers rather than stopping on cue.
Etta Place, often treated as a side character, helps explain why the trail stayed alive. The archive holds a separate Etta Place file, which includes the 1901 New York photograph of her with Sundance before they emigrated. Another exhibit states Pinkerton used photographs of Sundance with Etta and other gang images in wanted posters. Investigators were mapping relationships, travel patterns, aliases, and the few faces attached to fixed names.
Etta’s origins, later fate, and role in the South American years are all uncertain, yet her file dates stretch beyond the main outlaw years, showing the hunt had become a network investigation that rarely ends the way legends do. What all this changes is the timeline of the late Old West itself. Popular memory likes a clean ending, and even contemporary journalism leaned that way, with the Washington Post describing the Wild Bunch as having disappeared with the march of civilization. But the archive shows a West in transition, where horseback escape still existed alongside global shipping lines, telegraphs, photographs, bank networks, private detectives, and international rumor chains.
By the time the story reaches Bolivia, Cassidy was already living inside a system of aliases, crossed borders, second-hand sightings, and institutional paperwork. The popular ending says 1908 and stop. The archival ending says 1908, then more letters, more checking, more uncertainty, more filing, and more pursuit.