In June 2010, 15-year-old Sergio Hernandez and his friends were playing chicken at the U.S.-Mexico border, daring each other to run up and touch the tall border fence separating Juarez, Mexico, from El Paso, Texas.
At some point during their game, U.S. border patrol agent Jesus Mesa arrived on a bicycle. He detained one of the kids on the U.S. side while the others ran away. Hernandez hid behind a pillar beneath a bridge on the Mexican side of the border. A cellphone video shows the boy peeking out from behind the column, before Mesa shoots and kills him.