Scientist stationed with the initial Atlantis expedition into the Pegasus Galaxy. He was irritated by Dr. Rodney McKay and Dr. Radek Zelenka's prime game, which they pitted against Lieutenant Aiden Ford, while they were attempting to survey a flooded pier of Atlantis.
Hays and McKay came into contact with Dumais long before the other members of the survey team, and ergo would have become infected simultaneously. McKay, who possessed the Ancient gene, was forced to watch as Hays succumbed to a hallucinatory virus.
Hot Zone - Hays joins McKay and several others on a survey mission into a flooded Atlantis pier and is killed by a hallucinatory virus that escapes containment.