Stone Sour has announced that the remaining shows on its spring U.S. headlining tour have been cancelled due to drummer Roy Mayorga suffering a "minor stroke."

In a message posted on the hard rock group's website yesterday (May 17), the band explains that Mayorga, who joined Stone Sour in 2006, suffered the stroke following the group's May 15 performance in Des Moines, Iowa. "He's doing great and is expected to make a 100% recovery," the band writes. "We apologize to all the fans and look forward to getting back out on the road with Roy in the coming months."

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Prior to the Des Moine show, Mayorga told Billboard.com that Stone Sour was enjoying its time on the road and particularly having a headline run after being part of packages such as the Nightmare After Christmas and Avalanche tours. "It's great, man. We're not constricted to any kind of time or anything like that," the drummer explained. "With some of the package tours you have to play a certain amount of time and can't go over. With this we can play as long as we want."

Mayorga's stroke led to the cancellation of five shows, including an appearance at this weekend's Rock on the Range. The group was then planning some time off -- during which frontman Corey Taylor and guitarist Jim Root are regrouping with Slipknot for summer show sin Europe -- before reconvening to play this year's Rock in Rio IV during Sept. 23-Oct. 2 in Brazil.

Meanwhile, Mayorga said, Stone Sour was already starting to eyeball its four album.

"We've definitely talked about that," he said. "It probably won't start 'til next year, but we all have little ideas rolling around in our heads right now. We don't write too much on the road because our headspace isn't really there -- at least mine isn't. For the most part we tend to write a little bit more in our off time. For ('Audio Secrecy') we all wrote separately and sent each other stuff over e.mail, then when we got together for pre-production we learned each other's songs and developed them as a band. I think that's probably the way it'll go this time, too."

Exactly one month before Stone Sour posted the news, the group announced on its website that bassist Shawn Economaki had "gone home for personal issues," and would not be joining the rest of the quartet on their spring tour. The band's trek was scheduled to conclude on Sunday in Columbus, Ohio.

Since its September release, Stone Stour's third album, "Audio Secrecy," has moved 172,000 copies, according to Nielsen SoundScan. The disc's first single, "Say You'll Haunt Me," topped the Rock Songs chart for nine weeks beginning last October; it currently resides at No. 14 on the tally.