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MIAMI CBSMiami/WCCO) – Minnesota Vikings offensive line coach and former Miami Dolphins head coach Tony Sparano died Sunday of heart disease, according to a report released Monday by the Hennepin County Medical Examiner.

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Sparano died Sunday in his Eden Prairie home. He was 56 years old. Team officials announced his passing on Sunday, saying it was unexpected.

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According to the medical examiner, Sparano was pronounced dead at 8:54 a.m. Sunday at his Eden Prairie home. His cause of death has been ruled arteriosclerotic heart disease, and his manner of death is natural. It’s described as a hardening and narrowing of the arteries, which puts blood flow at risk.

He was the Dolphins’ head coach from 2008-11 and went 29-32. He went 11-5 and won the AFC East in his first season with Miami.

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Sparano joined the Vikings coaching staff in 2016. He is survived by his wife, Jeanette, two sons, a daughter and four grandchildren.