Doctor Hays was a Tau'ri scientist and a member of the Atlantis expedition. During the first year of operation, as he was inspecting the storm-damaged parts of the city and was in the same group with Dr. Rodney McKay, Dr. Radek Zelenka and Lt. Aiden Ford. He showed a lack of interest in the Prime/Not Prime games. He co-researched the lab that Dr. Johnson and Dr. Wagner discovered. And when Dr. Dumais began to see shadows, she ran into him. After a time he began to see shadows and he died, and became the fourth victim of the virus. (SGA: "Hot Zone")