An official from the medical examiner's office for Martin County, Florida confirmed with TMZ they received a call from Martin Memorial Hospital informing them that Jones had passed away.
Jones is survived by his wife Jessica and 4 daughters from previous marriages. He was 66-years-old.
Jones joined The Monkees in 1965 ... along with Micky Dolenz, Michael Nesmith and Peter Tork ... and together they churned out a bunch of hugely popular songs including 3 number 1 hits -- "Daydream Believer," "Last Train to Clarksville" and "I'm a Believer."
Monkees singer Davy Jones dead at 66
Sad news: Davy Jones of the Monkees is dead from a heart attack at age 66, TMZ reports.