Primus star Tim Alexander is set for surgery after suffering a heart attack.

The news was broken by his longtime collaborator Maynard James Keenan, who posted a note on on Friday (18Jul14).

It read: "Calling All Cars! Rough news. @timalexander suffered a heart attack. Open Heart Surgery on Mon/Tues. Global Positive Thoughts, Por favor."

Alexander has appeared on a number of Primus albums and he has also worked with A Perfect Circle and the Blue Man Group in Las Vegas.