Posted on 07/13/2012

Michael Clarke Duncan is in the intensive care unit at an L.A. hospital after going into cardiac arrest this morning ... and might have died if not for the swift action of his girlfriend Omarosa Manigault. 

Manigault discovered the "Green Mile" actor in a state of cardiac arrest just before 2:00 AM. 

She performed CPR and was able to resuscitate the 54-year-old. 

Duncan was transported to a nearby hospital where he was immediately admitted to the ICU. 

His heart rate is now stable and Manigault is by his side. Doctors are performing tests to figure out why the actor's heart stopped in the first place. 

"According to doctors, Michael Clarke Duncan is now stable and we look forward to his full recovery."