LOS ANGELES (Reuters) - The son of "Soul Train" creator Don Cornelius said on Thursday his father called him shortly before taking his life, and that he was unhappy and in failing health but kept most of his feelings inside. Don Cornelius, 75, shot himself in the head at his Los Angeles home early on Wednesday, shocking "Soul Train" fans and hundreds of musicians who appeared on the pioneering 1970s music and dance TV show. Tony Cornelius, who worked closely with his father on "Soul Train" told "CBS This Morning" that he had received a phone call from his dad on Wednesday morning. ...