An Anaheim man whose infant daughter died earlier this month after he left her in a hot minivan said Friday that vehicles should have warning systems to remind parents that a child is inside. Flanked by his wife, Jennie, and attorney R. Dennis Rentzer, John Michael Dunton spoke for a few minutes at his attorney's Encino office, a day after the Orange County district attorney announced he would not pursue charges against the 42-year-old.