Apple and the family of Steve Jobs are not saying what caused the death of the company's founder. However, medical experts not involved in his care say that the liver transplant he had two years ago was probably a sign that his cancer had returned.
Jobs declared he was cured in 2004 after surgery for a rare type of pancreatic cancer that grows more slowly and is more treatable than the more common type. Yet this type of cancer often returns or spreads, usually to the liver.
Jobs has been on a medical leave since early this year for medical problems he wouldn't discuss in detail. He resigned as Apple's chief in August.