Despite his diagnosis, Hal continued to record music and his songs would often reach the Billboard Hot Country Songs charts.
Celebrity pals and fans alike have flocked to social media and offered their condolences.
Singer Leanne Rimes wrote: “So sad to hear that Hal Ketchum has gone to live amongst the angels. We will miss you down here, Hal! He was such a talent and a dear soul. #riphalketchum.”
Joe Bonsall tweeted: “Rest Easy brother Hal Ketchum…”