Grady was born in San Diego, California on June 8, 1944. Grady was married two times; first to Julie Boonisar from 1976 until they divorced in 1979. Lastly he was married to Virginia Lewsader from 1985 until his death in 2012. Grady died on June 27, 2012 in his home in Thousand Oaks, California from cancer. He was 68 years old.