
Haggard was married five times, first to Leona Hobbs from 1956 to 1964. They had four children: Dana, Marty, Kelli, Noel. They divorced, and in 1965 he married singer Bonnie Owens, former wife of Buck Owens, and a successful country singer at the time. Haggard has credited her with helping him make his big break as a country artist. Haggard shared the writing credit with Owens for his hit "Today I Started Loving You Again", and has acknowledged, including on stage, that the song was about a sudden burst of special feelings he experienced for her while they were touring together. She also helped care for Haggard's children from his first marriage, and was the maid of honor for Haggard's third marriage. Haggard and Owens divorced in 1978, but remained close friends as Owens continued as his backing vocalist until her death in 2006. In 1978 Haggard married Leona Williams; they divorced in 1983. In 1985 Haggard married Debbie Parret, but they divorced in 1991. He married his fifth wife, Theresa Ann Lane, on September 11, 1993. They had two children, Jenessa and Ben.
Haggard underwent angioplasty in 1995 to unblock clogged arteries. On November 9, 2008, it was announced that Haggard had been diagnosed with non-small-cell lung cancer in May of that year and underwent surgery on November 3, during which part of his lung was removed. Haggard returned home on November 8. Less than two months after his cancer surgery, Haggard played two shows on January 2 and 3, 2009, in Bakersfield at Buck Owens' Crystal Palace, and continued to tour and record until his death. On December 5, 2015, Haggard was treated at an undisclosed hospital in California for pneumonia. He made a recovery, but postponed several concerts. In March 2016, Haggard was once again hospitalized with pneumonia. Concerts for April were cancelled due to his ongoing battle with double pneumonia. Haggard died on April 6, 2016, his 79th birthday, at his home in Palo Cedro, California, just outside Redding, California.