Playboy mogul Hugh Hefner died of cardiac arrest and respiratory failure after contracting septicemia, an infection caused by e. coli that is resistant to drugs, according to The Blast.
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Hefner died on Sept. 27 in his home surrounded by his wife, Crystal Harris, and his four children. He was 91 years old.
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The media mogul was in poor health in the last six months of his life and a long-term back condition that limited his mobility, his ex-girlfriend Barbi Benton told PEOPLE.
Hefner was buried next to his first-ever centerfold, Marilyn Monroe, on Saturday at Westwood Village Memorial Park in Los Angeles in a private service from family.