Gareht Parkashoff was the leader of the FTL cell in Robat, Iran.
According to Sloane, Gareth was assassinated by Martin Shepard a month ago. Since he was dead, SD-6 needed a sample of his DNA to activate an encoder that they stole. Sydney was sent to an asylum in order to recover the information from Shepard about the whereabouts of his body. (Reckoning)
After Shepard gained his memory, he told Sydney that his body was located in the Lousiana marshlands near the Texas border. (Color-Blind)