Nearly a week after Apple co-founder Steve Jobs' death at age 56, the Santa Clara County Public Health Department released the cause of death Monday.
According to the New York Times, Jobs died as a result of respiratory arrest caused by a pancreatic tumor around 3 p.m.
No autopsy was performed on Jobs, who was buried Friday in a nondenominational cemetery. The death certificate lists respiratory arrest as the immediate cause, with "metastatic pancreas neuroendocrine tumor" listed as the underlying cause.
Jobs, who had struggled with pancreatic cancer for several years and who resigned as CEO of Apple on August 24 to deal with his health issues, died five years after the onset of the pancreatic tumor.
Doctors determined that he had a rare form of pancreatic cancer in 2003, and he underwent a liver transplant in 2009.
Jobs' health was so fragile, the Times noted, that Apple notified the Palo Alto, California, police department a few days before the tech icon's passing that Jobs was expected to die in the hope that patrols would be at the ready in case mourners gathered at Jobs' home.
The day before his death, Apple announced the upcoming release of the latest version of the iPhone, the 4S. It marked the first time Jobs was not on hand to introduce one of the popular touch-screen phones.
In a testament to their popularity, the phone might become the fastest-selling device ever for Apple, with pre-orders of more than 1 million in the first 24 hours after the phone went on sale Friday. Demand is so high, in fact, that new orders won't ship for several weeks, and analysts are predicting that more than 3 million units will blow out in the first weekend of official sales.