Musicians and other celebrities are reacting with shock and grief over the death of Eagles guitarist Glenn Frey.

Frey, who co-founded the rock band with Don Henley, died of complications from rheumatoid arthritis, acute ulcerative colitis and pneumonia at the age of 67 on Monday.

In statement, Henley said that crossing paths with Frey in 1970 changed his life "forever," and had an "impact on the lives of millions of other people all over the planet."

"It will be very strange going forward in a world without him in it," he wrote.

"But, I will be grateful every day that he was in my life. Rest in Peace, my brother. You did what you set out to do, and then some."

Frey's death also elicited sadness and surprise from fellow musicians and other performers on social media.

Paul Stanley, the rhythm guitarist for Kiss, expressed his shock over the rock star's death, and recalled trading stories with him at the Rock and Roll Hall of Fame.

Meat Loaf took to Facebook to mourn the loss of Frey, and praised the Eagle's "Hotel California" as his "favourite album of all time."

Cameron Crowe -- who worked for Rolling Stone magazine in the 1970s, when the Eagles were at the pinnacle of their success –- shared a photo of them taken by his high school friend Gary Elam for a 1972 article.

Brian Wilson, the lead singer of the Beach Boys, said hearing about Frey's death was a "real blow."

Several country music stars, including Tim McGraw and Brad Paisley, also expressed their sadness over Frey's death.

Meanwhile, Canadian rock band Nickelback said they were "saddened" by Frey's death, and noted that another "legend" had died. David Bowie and Alan Rickman died last week from cancer.

Numerous Hollywood actors, including Miles Teller and Chris Evans, also mourned Frey's loss.

Comedian Steve Martin also reminisced about a meeting with Frey.