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More details have come to light regarding the passing of Hugh Hefner.

As many of you know, Hef, as he was affectionately known by his friends and family, passed away last week at the age of 91.

A death certificate obtained by The Blast reveals the Playboy founder died from respiratory failure. Before his passing, he went into cardiac arrest.

It’s worth noting that Hef was also suffering from a blood infection and had recently been treated for an E. Coli infection.

The E Coli infection lingered and seemed to be resistant to antibiotics.

To see the death certificate please click here.

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