Upon the news of Neal Casal’s sudden passing, the guitarist’s friends and colleagues in the music industry have been sharing messages of grief and remembrance.

“I can’t believe I’m having to say goodbye to my friend and my brother,” wrote Chris Robinson, who first met Casal when Beachwood Sparks opened for the Black Crowes and, later, shared countless stages with him as a key member of the Chris Robinson Brotherhood. “It’s almost too painful. When I think about the songs we’ve written, the shows we’ve played and all the laughs and great times we shared it’s almost unbearable to know you’re gone. All of us in this rock & roll life have had to say goodbye to too many people too soon. I can only wish that you’ve found your peace returning to the wisdom of the universe. I miss you so much already, Neal. I’ll see you again, someday past the sunset.”

Drummer Joe Russo also shared a message saying he was “heartbroken” over the loss of Casal. “Rest easy, my friend,” he added. “I love you with all my heart. I’m so thankful I got to share a slice of life with you.” (Casal recently finished the collaborative EP, Circles Around the Sun Meets Joe Russo, with the Almost Dead drummer.)

Casal played his final set of live music at this past weekend’s LOCKN’ festival, as a part of Oteil Burbridge’s “Oteil & Friends” set.

“I just started to really get to know Neal and he was one of those people that I felt such genuine warmth from,” Burbridge wrote alongside a photograph of Casal smiling with the Dead & Co. bassist’s son. “My heart goes out to his family, friends and brothers of the road. This hurts so terribly much. I was looking forward to seeing that smile so many more times.”

Bob Weir, who was also a part of the Oteil & Frinds LOCKN’ set, posted a photo of the group of musicians who shared the stage, writing, “My last memory of Neal will be the smile he left me with…”

Pedal-steel guitarist Robert Randolph shared on Twitter, “I did my first ever demos with family band with [Neal Casal] on guitar. He Introduced me to the stones and Grateful Dead when I was 21. We took him on tour to meet Eric Clapton and play during the tour. Neal was so excited that he stood on stage didn’t play guitar and took pics.”

Shooter Jennings, another Casal collaborator over the years, wrote, “I am absolutely devastated with the news of the loss of my dear friend and consistent collaborator Neal Casal—he was always my favorite picker in LA and we’d all just finished some beautiful music together. I’m really just hollowed out by this.”

“What an honor to have known you, true believer,” Ryan Adams—who tapped Casal for his band The Cardinals—wrote, “I love you. Go easy,” calling Casal “the kindest soul” and sharing a story about Casal supporting him onstage when he would go through spells of ocular migraines.

Check out some photos the musicians shared in memory of Casal, and watch a clip of his LOCKN’ Oteil & Friends performance below: