Michael Clark Duncan Death Cause Was Respiratory Failure

Actor Michael Clark Duncan had passed away due to a respiratory problem, according to his death certificate.

The document listed respiratory failure was reported as the immediate cause of his Sept. 3 death.

An underlying cause of Duncan's passing was listed as anoxic encephalopathy, which is a severe lack of oxygen to the brain.  It had been previously reported that actor's organs were badly damaged proceeding a cardiac arrest episode on July 13, in which he went without any oxygen for five complete minutes.

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Other underlying causes listed included ventricular fibrillation (irregular quivering heartbeat), as well as an acute myocardial infarction (heart attack).  Organ nodules (sarcoidosis) were also one of the contributing factors.

Two weeks after his initial cardiac arrest, the 54-year-old had gotten a tracheotomy to assist him with breathing.

Heart broken fiancé Omarosa Manigault had been seen in public on Sept. 4th for the first time since the passing of the "The Green Mile" standout.  Upon heading through LAX airport, the mourning girlfriend was witnessed breaking down in tears.

The former "Apprentice" star had allegedly been reassured that Duncan was recovering.  However, his decline was said to be "slow but steady," as his kidney, pancreas and a high blood pressure ultimately led his body to "shut down," according to the site.

A statement had been released through Omarosa's publicist on Sept. 3rd.

"Manigault is grateful for all of your prayers and asks for privacy at this time.  Celebrations of his life, both private and public will be announced at a later date."

According to Daily Mail, fellow "Green Mile" actor Tom Hanks had also put out a heart-felt message on Sept. 5^th while he referred to Duncan as "Big Mike."

"I am terribly saddened at the loss of Big Mike.  He was the treasure we all discovered on The Green Mile.  He was magic.  He was a big love of man and his passing leaves us stunned."