How did JD Souther die? Eagles and Linda Ronstadt hitmaker was scheduled to perform in Phoenix

Souther also acted in several TV shows and films, including 'Thirtysomething' and 'Nashville'.

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Souther is best known for co-writing some of the Eagles' biggest hits, including 'New Kid in Town'.

Phoenix, Arizona: John David 'JD' Souther has died at the age of 78. The cause of his death has not yet been disclosed. Souther was about to start a tour with Karla Bonoff on September 24 in Phoenix. The show has now been canceled.

Souther, who was born on November 2, 1945, in Detroit, Michigan, is best known for his work in the 1970s, when he collaborated with celebrated artists like the Eagles, Linda Ronstadt, and James Taylor.

Singer/Songwriter J.D. Souther and James Taylor perform at The Atlanta Civic Center in Atlanta Georgia May 13, 1981 (Photo By Rick Diamond/Getty Images)

Souther is best known for co-writing some of the Eagles' biggest hits, including 'Best of My Love', 'Heartache Tonight', and 'New Kid in Town'. His friendship and professional relationship with Linda Ronstadt also led to him writing songs for her and producing some of her early work.

Souther’s own music career includes several solo albums, with his 1979 album 'You're Only Lonely' producing the hit single of the same name. His songwriting style is reflective of the Laurel Canyon scene, where he was closely associated with musicians like Jackson Browne and Glenn Frey.

Souther also acted in several television shows and films, including recurring roles on 'Thirtysomething' and 'Nashville'.