On May 20, 1997, Esequiel Hernandez, Jr. was herding his family's goats 100 yards from his home on the US-Mexican border in Redford, Texas, as he did every day. Six days before, he had turned 18 years old.
Unknown to Esequiel or any of the other residents of Redford, a group of four Marines led by 22-year old Corporal Clemente Banuelos had been encamped just outside the small village along the Rio Grande River for three days. After watering his small flock of goats in the river, Esequiel started on his way back home when the Marines began stalking him from a distance of 200 yards.
The four camouflaged Marines were outfitted with state-of-the-art surveillance equipment and weapons. Esequiel carried an antique .22 caliber rifle -- a pre-World War I, single shot rifle to keep wild dogs and rattlesnakes away from his goats. The autopsy showed that Esequiel was facing away from the Marines when he was shot. He probably never knew the Marines were watching him from 200 yards away.
This sounds like it was the inspiration for the excellent Tommy Lee Jones movie, The Three Burials of Melquiades Estrada. Put it at the top of your Netflix list if you haven't seen it yet.