He was the leader of the Great Khans hired by Benny to retrieve the package from the Courier and is mentioned on Manny Vargas' computer terminal. After his death, Jessup, the next highest ranking Khan, took over; this is when the Courier finds them in Boulder City. His body is found lying on a dirty mattress in the Great Khan hideout in Boulder City.
McMurphy worked with a Chairman named Benny and fellow Great Khan Jessup to intercept the platinum chip from the Courier. In the Fallout: New Vegas intro, McMurphy wanted to kill the Courier quickly, but Benny insisted he look his victim in the face when he kills them.