demanding accountability, and does the video now put into question what authorities had said before? abc's chief national correspondent matt gutman with the images, and we warn you, they are disturbing. >> reporter: tonight, that disturbing new video, the last minutes of a 16-year-old's life in a border patrol cell. on may 19th, a week after carlos vasquez crossed into the u.s., a nurse at this processing facility diagnosed him with the flu. he had a fever of 103. he was to be reassessed in two hours and hospitalized if symptoms worsened. border patrol officials took him to a quarantine facility in a small texas town where he was put into a cell with concrete slabs and foil sheets. as you can see in this video obtained by propublica, which broke the story. vasquez, from guatemala, is obviously suffering. he writhes on the concrete then crashes to the floor, where he lays for several minutes. he eventually musters the