Photo: Gary Miller/Getty

AUSTIN, TX - APRIL 17: Keith Gattis performs in concert during the “Mack, Jack & McConaughey Present Jack Ingram & Friends” concert at ACL Live on April 17, 2015 in Austin, Texas. (Photo by Gary Miller/Getty Images)

Keith Gattis, a Nashville songwriter who wrote songs forGeorge StraitandKenny Chesney, has died. He was 52.

A source close to the musician confirmed toRolling Stonethat hedied on Sunday. His cause of death has not yet been confirmed.

MusiciansSheryl Crow,Jason Isbell, John Osborne and Kendell Marvel reacted to the news of Gattis' death on social media.

Paul Natkin/Getty

American Country musician Keith Gattis performs onstage at the Petrillo Band Shell during the Taste of Chicago/Chicago Country Music Festival, Chicago, Illinois, July 1, 1996. (Photo by Paul Natkin/Getty Images)

“Woke up to the news that Keith Gattis has gone on. He was a wonderful person, an incredible talent, and a well loved friend to all who knew him. He will be missed,” Crow, 61,tweeted.

Isbell, 44,wrote, “So many people I care about are grieving the loss of Keith Gattis today. I didn’t know him well but I definitely respected him as a musician and songwriter, and it’s clear that he was a great friend. My heart breaks for all y’all.”

“Verified The Nashville community lost a giant. Keith Gattis was the most real person you’d ever meet in your life. An extraordinary talent on every level,” Osborne, 40,wrote on Instagram. “He’s the reason I play B Bender Tele. He lent me his for ourPort Saint Joerecord and I’ve been hooked ever since. (Guitar pickers: Listen to Dwight Yoakam’s Blame The Vain to hear Keith’s B Bender mastery) Was lucky to get to know you, Keith. You and your music have made an impact that will outlive us all. 💔”

“Marvel, who worked with Gattis on his albumLowdown & Lonesome,captioned in an Instagram post, “I met @keithgattis through our bud @stevemarkland in 2008 and we hit it off immediately. I know people say this all the time but I mean it with all my heart when I say I would not be out here doing what I’m doing today without Gattis. We made my first record together and wrote most of the songs. Hell, we started The Honky Tonk Experience together.”

Gary Miller/Getty

AUSTIN, TEXAS - APRIL 15: Keith Gattis performs in concert during the 4th annual Mack, Jack & McConaughey charity event at ACL Live on April 15, 2016 in Austin, Texas. (Photo by Gary Miller/Getty Images)

Originally from Georgetown, Tex., Gattis started out as a solo artist with RCA Records. He released a self-titled debut album in 1996 with the single “Little Drops of My Heart” reaching close to the Top 40 ofBillboardHot Country Singles & Tracks, according toRolling Stone.

Per hiswebsite, Gattis played guitar on tour and was the band leader and producer forDwight Yoakam. In 2005, he dropped his second studio albumBig City Bluesand began writing and recording tracks for Strait and Chesney.

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The two collaborated again on “When I See This Bar” for Chesney’s 2013 LP. At the time, he also worked with Strait on his 2015 albumCold Beer Conversationas well as to write Tom Douglas' “I Got a Car.”

His website states that Gattis went on to produce several albums under Pioneering Recording, includingRandy Houser’sMagnolia, Wade Bowen’sSolid Groundand Waylon Payne’sThe Drifter.

source: people.com