Barroso was a Sergeant in the United States Marine Corps and part of the Atlantis expedition. In 2006, he was part of the team that traveled to M1B-129 to locate Major Leonard's team. He was shot by Leonard in the shoulder and some time later he died from internal bleeding, mainly due to the mind manipulator causing Beckett to see a hallucination of a Barroso who was alive and well, keeping him from treating the real Barroso's injury when it worsened. By the time Beckett realized Barroso was dead, he was already cold and in rigor mortis, meaning he had been dead for some time at that point. (SGA: "Phantoms")

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