 Griffith Joyner and Joyner had one daughter together, Mary Ruth Joyner, born November 15, 1990.On September 21, 1998, Griffith-Joyner died in her sleep at home in the Canyon Crest neighborhood of Mission Viejo, California, at the age of 38.The unexpected death was investigated by the Orange County Sheriff-Coroner's office, which announced on September 22 that the cause of death was suffocation during a severe epileptic seizure.