A post on Puscifer's Facebook page says the 49-year-old suffered a heart attack, and is expected to go under the knife Monday or Tuesday. The post also asks fans for "global positive thoughts."
Alexander's on-again, off-again career with Primus dates back to the band's 1990 debut Frizzle Fry. He's left and rejoined the group a number of times, starting his latest stint last year.
In addition to Puscifer, Alexander has also worked with A Perfect Circle and the Blue Man Group in Las Vegas.
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