He is Jason Voorhees' 69th victim.
Jim, a high school student, is first seen on his parents' boat having sex with his girlfriend Suzy Donaldson. Following their encounter, he attempts to scare his girlfriend by relating to her the story of Jason Voorhees, a serial killer who struck on several previous occasions along the shore of Crystal Lake. Ironically, the story is punctuated by the boat's anchor striking an underwater cable; the electrical current carried by this cable revives the corpse of Voorhees which had laid dormant at the bottom of the lake following his defeat at the end of Friday the 13th Part VII: The New Blood.
Miller, unaware of this fact, tries to frighten Donaldson further with a hockey mask even as the real Voorhees climbs aboard the vessel and retrieves a spear gun before confronting the couple. Donaldson flees in terror, leaving Miller to his fate; Voorhees disembowels the shocked teenager with the spear gun while retrieving the mask and substituting it for his own, which he had lost. Miller perished almost instantly, and Donaldson was killed shortly thereafter in a similar method.
Their deaths went initially unnoticed by the Crystal Lake community, and their absence from the launch of the SS Lazarus the next day was believed to be simple absenteeism. Voorhees, as a result of the incidental resurrection by Miller and his family's vessel, went on to board the Lazarus and commit more than a dozen homicides involving members of the crew and passengers, among them many of Miller's peers. The rampage was only stalled in New York City, the final destination of the Lazarus.