Dr. Monroe was a Tau'ri engineer and member of the Atlantis expedition. In 2005, he was aboard the Daedalus on its return voyage to the Pegasus galaxy. While attempting to locate the cause of erroneous behavior in the Daedalus computer, he was electrocuted and killed. It was later revealed that the culprit was a Wraith computer virus, which had possibly been uploaded to the ship during the time Atlantis was battling the Wraith . (SGA: "The Intruder")