Stone Sour will be cancelling their remaining tour dates in May, including their appearance on the Rock On The Range festival. The band has issued the following statement regarding the cancellations:

"It is with regret that we have decided to cancel the remaining dates on our current headline tour.  Our friend and drummer, Roy Mayorga suffered a minor stroke a couple of nights ago after our show in Des Moines.  He’s doing great and is expected to make a 100% recovery.    We apologize to all the fans and look forward to getting back out on the road with Roy in the coming months."
 
-Stone Sour 

We wish Roy a speedy recovery!