Billy the Kid's pretenders

"In the real world, Sheriff Pat Garrett fatally shot William Bonney aka Billy the Kid on July 14, 1881. In the imaginary world of Billy the Kid pretenders, and modern Billy the Kid hoaxers, Garrett did not; and the Kid survived to old age." In this book, the author, a Harvard educated psychiatrist, debunks two of these Billy the Kid pretenders : "Brushy Bill" Roberts and John Miller.