William and Thomas Halderman (21 and 18 years old, respectively, when they died) were ranch kids from a well to do Texas family, but were working as cowboys in Cochise County, Arizona in 1899. Each had an interest in one or the other of two sisters, Rena and Mary Wilson, and were visiting the young women at the Wilson ranch on the morning of April 7. Around noon, the law showed up.
Constable Chester Ainsworth had a warrant for the arrest of the Halderman boys on a charge of "illegally killing cattle" and selling the meat. With him was an 18-year old deputy named Teddy Moore. (Who also had a passing interest in one of the Wilson girls.) The constable and his young deputy were sitting on their horses outside the Wilson house, and called for the Haldermans to come out and give themselves up. At first it looked like a routine, peaceful arrest, but then -- nobody could say why -- shooting started; Ainsworth fell from the saddle with a bullet through the heart, and Teddy Moore rode away like a bat out of hell. A rifle slug hit him "in the bowels" but he made it home and died in his mother's arms. Before he died, he told his family the Haldermans fired first, and the Wilson sisters, Mary and Rena, substantiated the story. The brothers fled to New Mexico, but were quickly nabbed.
As the brothers were led out the side of the courthouse and toward the gallows, Thomas Halderman said, "Hello, hombres... The sun's hot, ain't it?" From the scaffold, William looked down and said, "Nice looking crowd. But some of you fellers are shaking already." Thomas put the noose around his own neck while the sheriff read the death warrant, and brother William chatted with a deputy. The sheriff asked if there were any last words and William said, "I have nothing to say. I guess it wouldn't do any good anyway. I forgive you all and I hope you'll forgive me." He asked for a moment for prayer, and a local minister stepped forward to assist. Black hoods were then dropped over the boys' heads, and in unison, they said, "Goodbye, boys! Pray for us." The trap door fell from beneath their feet at 12:40 pm.
It was the last hanging in Tombstone, and the Halderman brothers were the last two condemned men (or boys) to be buried in Boot Hill.
Addendum: Rena Wilson killed herself shortly after the hangings, and in 1913 her sister Mary was committed to an insane asylum.