I am crushed....

Davy Jones -- lead singer of The Monkees -- died after suffering a heart attack this morning ... 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.

A rep for the singer tells us Jones suffered a heart attack at his home this morning ... and was transported to a hospital where he was pronounced dead.

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."

Here is some cellphone video from Youtube that was shot not even a couple of weeks ago...

I am so sad to hear this. I was a huge fan of The Monkees before I discovered The Beatles. I was 5 years old and watched the re-runs of the show with my friend Jennifer. One of our first crushes for sure.

Davy Jones...Rest in Peace. We will miss you.

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via Davy Jones Dead -- Monkees Singer Dies at 66 From Heart Attack | TMZ.com.