Haggard's manager, Frank Mull, said the country icon died in Palo Cedro, California, of pneumonia that he had been battling for months. He had kept up an ambitious touring schedule, but the pneumonia in both lungs had forced him to cancel several shows this year.
A masterful guitarist, fiddler and songwriter as well as singer, the Country Music Hall of Famer with the firm, direct baritone recorded for more than 40 years, releasing dozens of albums and No. 1 hits.
Haggard - along with fellow California country star Buck Owens - was a founder of the twangy Bakersfield Sound, a direct contrast to the smooth, string-laden country records popular in Nashville, Tennessee, in the 1960s.