Singer Davy Jones of The Monkees has died of a heart attack at 66, the medical examiner's office in Martin County, Fla., has confirmed to NBC News. The news was originally reported by TMZ. Jones was most famous for his role in the pop group The Monkees, which was put together in 1965 for the TV show of the same name. Their hits included "Daydream Believer," "Last Train to Clarksville," "I'm a Believer," and "Pleasant Valley Sunday." They also charted with the theme song from the show.