A rep for Davy Jones says the Monkees singer died from a heart attack this morning.

From TMZ:

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 hits including, "Daydream Believer," "Last Train to Clarksville" and "I'm a Believer."

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