Rick Willis was a Special Forces Major who was possessed by a Khan worm.
Background[]
He and Kit Verson intervened to free Major Matt Jones, imprisoned in a cemetery by Iraqis. When they arrived, Jones attacked them and then infected them with a Khan worm. They then killed Jones in self-defense.
Khan's worm gradually dried him up and he began to drink all kinds of water, even drinking bath water. He later kidnapped soldier Jacki Prescott, hung her upside down and then slit her throat to drink her blood. Shortly after, he doused himself in gasoline and then set himself on fire, killing himself.