After driving a herd of cattle into the Dakota Territory, Edmond P. Clark and Robert Massey returned home to Texas. En route, they stopped in Indian Territory in December 1881, where Massey killed Clark. He then stole his horse and gun, hid his body, and rode off.
When Clark did not return home, his family made inquiries. When a body was discovered, the connection was made with those inquiries. After further investigation confirmed that the body was Clark, the search for Massey began.
Robert Massey was arrested near Fort Sill in April 1882. Taken to Fort Smith, he was tried on the circumstantial evidence that had been collected. In his defense, Massey argued that he had acted in self-defense. He was found guilty on December 11, 1882, and sentenced to death on February 1, 1883.
Robert Massey was hanged on April 13, 1883.
The Federal Death Penalty Project 