After Sheriff
Pat Garrett gunned down
Billy the Kid in July 1881, he asked Marshall "Ash" Upson to
ghostwrite his version of the story.
The Authentic Life of Billy the Kid came out in early 1882, but failed to sell until years later. Upson and Garrett formed a real estate company in 1889, which failed. Although not many copies of
The Authentic Life of Billy, the Kid were sold, it had a decisive impact on the Kid's image. More than any other single influence, the book fed the legend of Billy the Kid. As the legend grew, writers turned to this book for authentic details. For more than a century, only a few researchers questioned the wild tales contained within Upson's book. ==Later years==