The Vagabond Kid and the Mistaken Identity

The Vagabond Kid and his faithful companion, Javier Pelaez are just riding about enjoying a wonderful morning. The two men are doing what they've always loved to do, which is explore and wander. The quiet peace of the morning however is broken when both men chance upon a horse with no rider wandering about. The Vagabond Kid inspects the horse more closely and discovers the saddle is bloodied up. The two men retrace the horse's tracks and discover a grisly sight.
The body of a man lies beneath a cliff from where the horse ran. The Vagabond Kid climbs down carefully and discovers the man is still alive, but barely. The man was shot and fell from his horse. Before the man expires, he tells the Vagabond Kid that an innocent man will be hung, and he has to try and stop it. The Vagabond Kid asks for more details but it's too late. The man expires and the Vagabond Kid is left with many tough, unanswered questions.
Who is thisman that was shot and killed? Who is the innocent man that will be hung and where? Can the Vagabond Kid and Javier prevent an innocent man from being hung for a murder he did not commit? The Vagabond Kid doesn't have the faintest clue where to start, but that does not deter him. Not a lot of things deter the Vagabond Kid from seeing true justice prevail.