He was on call when Major Charles Kawalsky reported to the infirmary with headaches. During the exam, Nimzicki discovered that Kawalsky was possessed by a Goa'uld Symbiote which had happened during the team's last mission through the Stargate. When the symbiote realized its identity had been discovered, it took control of Kawalsky's body and killed Nimzicki by snapping his neck straightaway before later going on to hid the body.