John Kresge

From X-Files Wiki

John Kresge (played by John Pyper-Ferguson) was a detective in San Diego who worked on the murder investigation concerning the wife of Marshall Sim. During the Scully family Christmas reunion, Dana Scully became invovled after receiving unusal phone calls that sounded like her deceased sister Melissa. Scully found herself becoming more and more involved with the case, particularly with regard to Emily Sim. Kresge assisted Scully during the investigation, despite his initial annoyance at Scully's constant presence near what Kresge deemed a local matter not suited for the FBI. (TXF: "Christmas Carol")

However, Kresge became more helpful upon the discovery that Emily was Scully's biological daughter and part of a larger conspiracy. Mulder and Kresge were seeking Dr. Calderon when they were approached by an alien bounty hunter. Mulder warned Kresge that his gun would be useless, but Kresge attempted to stop the bounty hunter anyway and was injured. (TXF: "Emily")