M'yri'ah J'onzz is the wife of J'onn J'onzz, who would later become the Martian Manhunter. They had a daughter together named K'hym J'onzz. She perished along with her daughter and the rest of their species during the fire plague known as H'ronmeer's Curse caused by Malefic. This wiped out all of Mars and left her husband as the last living Martian. M'yri'ah J'onzz was created by J.M. DeMatteis and Mark Badger, first appearing in Martian Manhunter #3. (1988)
