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Michael Joseph Porcaro (May 29, 1955 – March 15, 2015) was an American bass player known for his work with Toto. He retired from touring in 2007 as a result of being diagnosed with amyotrophic lateral sclerosis (ALS).
He was the middle brother of Toto members Jeff Porcaro and Steve Porcaro. Their father was jazz drummer-percussionist Joe Porcaro.