Co-writer of Monkees hits Bobby Hart, influential in '60s pop culture, has died at 86.

Bobby Hart, co-writer of Monkees hits like "Last Train to Clarksville," has died at 86. Hart and partner Tommy Boyce were key in the band's success, writing and producing their debut album. They also worked on TV shows like "I Dream of Jeannie" and "Bewitched." Hart's career extended beyond the Monkees, contributing to the Partridge Family and other artists. He was part of a 2014 documentary about their work.