JD Souther, the singer, songwriter and actor who co-wrote some of the biggest hits of the Eagles, like “New Kid in Town” and “Best of My Love,” and had a long solo career that included the top 10 hit “You’re Only Lonely,

John David “JD” Souther, a prolific songwriter and musician who helped shape the country-rock sound that took root in Southern California in the 1970s with his collaborations with the Eagles and Linda Ronstadt,

Souther was close friends with the Eagles and helped write some of their many hits, including “Heartache Tonight” and “New Kid in Town.”