Death of a Texas Ranger is the thrilling, action-packed story of the murder of Texas Ranger John Green by Cesario Menchaca, one of three Rangers of Mexican descent under Green's command. Immediately word spread that the killing may have been the botched outcome of a contract taken out on Menchaca's life by the notorious Gabriel Marnoch, a local naturalist who had run up against the law himself. But was it? Much more than just a story about a tragic frontier killing, it is the story of an era. The events leading up to the murder and Green's son's decades' long quest for justice for his father's killer exemplify the chaotic frontier society in Texas after the Civil War, a time fraught with political turmoil and cultural clashes. Amidst that chaos, the virgin landscape of Texas was a magnet to those interested in the natural sciences in the nineteenth century, an era often referred to as the Age of Darwin. The clash between the seemingly pastoral landscape with its offerings for science and the brutal history of the region ties this very readable regional history into the larger American story.