Mexican mom seeks justice for son killed by US border guard Maria Guadalupe Guereca wants just one thing: "Justice." In a choked voice, the 59-year-old woman recounts the death of her teenage son, fatally shot on Mexican soil by an American policeman standing on the US side of the border. "He was taken away from me forever," the gray-haired mother said, sitting on the bed in her small home. The killing of Sergio Hernandez Guerece will be examined by the US Supreme Court on Tuesday, coming at a time when President Donald Trump has called for building a border wall to keep out Mexican undesirables. IMAGES AND SOUNDBITE