MONKEES SINGER DAVY JONES DEAD AT 66 From Heart Attack

9:55 AM PST -- A rep for Davy tells TMZ the singer died from a heart attack this morning.
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 Davy Jones -- lead singer of The Monkees -- has died ... TMZ has learned. 

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 was married to Jessica Pacheco -- his 3rd wife. 

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."


The group was initially cast by TV producers who wanted to create a scripted series about an actual rock n' roll band.  But the group exploded, and Jones in particular became a Beatles-caliber heartthrob.

The Monkees songs were covered by huge bands like Coldpay, and Smash Mouth's version of "I'm a Believer" was famously featured in "Shrek." 

Davy's last performance was on February 19th in Oklahoma -- the night before, he performed "Daydream Believer" and "It's Nice to Be with You" at the BB King Blues Club in NYC ...