prosecution witness changed his story and testified under immunity that he caused the prisoner's death not gallagher. >> did you suffocate him? >> yes. >> how? i put my thumbs over his et tube until he stopped breathing. >> reporter: scott described the killing as an act of mercy because he was concerned the boy, a prisoner of iraqi forces would be tortured by them. gallagher was convicted on the charge of taking a photo with a dead isis fighter and then demoted in rank. a decision president trump reversed allowing the s.e.a.l. to retire with honor, even after pentagon leaders urged the president not to interfere. speaking through his attorney gallagher told cnn my first reaction to seeing the videos was surprise and disgust that they would make up blatant lies