Gregg Allman, whose hard-jamming, bluesy sextet the Allman Brothers Band was the pioneering unit in the Southern rock explosion of the ‘70s, died Saturday due to currently unknown causes. He was 69. As recently as April 24, reports surfaced claiming Allman was in hospice. His manager previously denied those reports to Variety, which Allman then substantiated in a Facebook post. However, he had suffered a number of ailments in recent years — including an irregular heartbeat, a respiratory infection, a hernia and a liver transplant — and cancelled many scheduled tour dates in recent months due to undisclosed health reasons.