Harris was a member of the Office of the Colonial Marshals on Sevastopol Station. He was part of Waits' team who were trying to hunt down and kill a Xenomorph that had made its way on board the station in 2137. He was eventually killed by the Drone.
After the Xenomorph appeared on the station and started wreaking havoc, Waits and his team were attempting to hunt down the Alien through the station and kill it. Eventually their hunt had led them to the station's engineering section where they had come across two dead bodies and a locked door. Whilst Waits and Turner were bickering, Garcia called out to the group that he had unlocked the door. After opening it, the Alien emerges from the other side of the doorway and Headbites him. Harris, in response, attempted to avenge Garcia's death by rushing the Drone, only to almost immediately suffer the same fate as him, with the Alien impaling him with its tail.