Randolph Mantooth, the actor who became a television icon as paramedic John Gage in NBC's Emergency!, has died at the age of 80. He died on July 9 at a hospice facility in Ventura, California, following a long illness, according to his brother.Randolph Mantooth was diagnosed with cancer in 2015 and passed away in a hospice following a protracted illness. (Randolph Mantooth Instagram)Mantooth was diagnosed with cancer in 2015.Mantooth became a household name in 1972 when he was cast opposite Kevin Tighe in Emergency!. The NBC drama ran for six seasons and followed the lives of Los Angeles County paramedics. Social media users have credited the series with introducing millions of Americans to the relatively new profession of paramedicine.Mantooth performed many of his own stunts and remained closely connected with firefighters, EMTs and paramedics long after the show ended.Also read: What did Mackenzie Shirilla tell Dominic Russo's mother after the fatal crash? Chilling texts resurfaceRandolph Mantooth's wife, kids and familyRandolph Mantooth is survived by his wife, Kristen Mantooth. According to reports, the couple remained together until his death. He is also survived by his siblings, Donald and Tonya.Publicly available records and biographies indicate that Mantooth did not have children. However, HT.com cannot independently verify this information.Mantooth's father was Seminole and Cherokee, and he was born in Sacramento. After attending Santa Barbara City College, he was awarded a scholarship to the American Academy of Dramatic Arts in New York.Also read: Tom Holland blown away by Indian fans at The Odyssey India premiere: ‘No one brings energy like you’Cause of death, net worth and lasting legacyAccording to The Hollywood Reporter, Mantooth died after a prolonged illness while receiving hospice care. He had publicly revealed his cancer diagnosis in 2015 but had reportedly recovered.