Almost instantly after learning that the great Merle Haggard passed away due to complications from pneumonia on his 79th birthday yesterday, country stars flocked to social media to pay their respects to the man who had such a huge impact in their lives and careers.

Haggard's son shared the news of Merle's passing with the world in this gut-wrenching Facebook post:

A week ago dad told us he was gonna pass on his birthday, and he wasn't wrong. A hour ago he took his last breath...

Posted by Ben Haggard on Wednesday, April 6, 2016

One of these days when my time has comeYou can take me back to where I’m fromPut me on a westbound train And ship me...

Posted by Eric Church on Wednesday, April 6, 2016

I just told my little girl Merle Haggard had passed away and gone to heaven. She said, "that's okay daddy, we will get...

Posted by Jake Owen on Wednesday, April 6, 2016

Posted by Willie Nelson on Wednesday, April 6, 2016

A life well lived-a heart well loved....Rest in peace old friend-there will never be another you. That's the way love goes.....

Posted by Montgomery Gentry on Wednesday, April 6, 2016

Merle Haggard. The man, the songs, the voice, the attitude - Iconic.

Posted by Tim McGraw on Wednesday, April 6, 2016

Truly saddened today to hear about the passing of Merle Haggard, a legend, hero and one of my biggest musical influences!!! #RIP

Posted by Easton Corbin on Wednesday, April 6, 2016

One of the gr8 concert memories I have is seeing Merle and the Strangers at the Ryman in Nashville. We had a "live"...

Posted by Keith Urban on Wednesday, April 6, 2016

It's a very sad day for all of us Hag fans. He was a true icon of the music world and it's hard to believe we won't be...

Posted by George Strait on Wednesday, April 6, 2016

Can't believe it. Seriously so sad to hear about Merle. The music and the mark he left on music will live forever.

Posted by Hunter Hayes on Wednesday, April 6, 2016

There are no words to describe the loss & sorrow felt within all of music with the passing of Merle Haggard. Thank God for his life & songs.

Posted by Brad Paisley on Wednesday, April 6, 2016

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