The Soka Gakkai Dictionary of Buddhism
Kokalika[瞿伽利] (Skt, Pali; Jpn Kugyari or Kukari)
A member of the Shakya tribe of ancient India and an enemy of Shakyamuni Buddha. He became a disciple of Shakyamuni but, falling under Devadatta's influence, slandered the Buddha's disciples Shariputra and Maudgalyayana. According to The Treatise on the Great Perfection of Wisdom, Kokalika was always looking for fault or error on the part of Shariputra and Maudgalyayana. One day, caught in a heavy rain, Shariputra and Maudgalyayana stayed overnight at a potter's house. Kokalika, who happened to pass by this house the next morning and to know that a woman also lived there, spread false rumors to the effect that Shariputra and Maudgalyayana had had relations with a woman, which was forbidden them as monks. Shakyamuni admonished Kokalika against spreading false rumors, but Kokalika refused to heed his admonition. It is said that on that day boils broke out all over his body and that he died that night in a fit of agony, falling into the hell of the great crimson lotus, the most terrible of the eight cold hells.