The Shroud, a unit of elite ghosts, entered the installation, seeking members of the Brontes IV Colonial Militia being held captive within. During their search, they encountered the Informant, who offered them information in return for his life and assistance in escaping. However, the Shroud read his mind and believed he was still a rebel, so they executed him.
StarCraft: Insurrection. Aztech New Media. Terran campaign, mission 2: “The Rebel Installation” (in English). 1998.