Davy Jones, the lead singer of beloved made-for-TV rock group The Monkees, died in Florida on Feb. 29. He was 66. The medical examiner in Marin County, Fla., confirmed the news to TMZ, and a rep for the singer tells the site that a heart attack was the cause of death. An England native, Jones shot to stardom in 1966 when he was cast alongside Micky Dolenz, Peter Tork and Michael Nesmith in The Monkeys, a TV show about a Beatles-inspired pop band. Although the series only ran until 1968, the group, which spawned such hits as "Daydream Believer" and "Last Train to Clarksville," has survived in different incarnations throughout the years. Jones is survived by his third wife Jessica and his four daughters from previous marriages.