Rigor Mortis is a villain in Marvel Comics, and an enemy of Ghost Rider.
Rigor Mortis' real name is unknown. Rigor Mortis is presumibly a demon that serves the demon D'Kay and commander of the "conqueror worms", demonic worms to whom she is like a mother. When some women raid her mausoleum to dig up some statues and monuments. She used her petrifying touch to transforms the women into stone and Ghost Rider confronts Rigor Mortis for attacking the innocent. After defeating her, Ghost Rider determines that without her, the worms will certainly die without a mother.