He was the leader of the Great Khans party hired by Benny to retrieve a package from the Courier, and is later mentioned on Manny Vargas' personal computer terminal. After his death, Jessup, the next highest ranking Khan, took over; this is when the Courier finds what is left of his party in Boulder City. His body can be 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.