Steve Jobs died of respiratory failure caused by the spread of a metastatic pancreas neuroendocrine tumour, according to his death certificate.

The certificate was filed in Santa Clara County, California and lists Jobs' occupation as a high-tech entrepreneur. No post-mortem was carried out and Jobs was buried in a private ceremony last Friday.

Jobs died at home in Palo Alto, California, on Wednesday 5 October after a long battle with a rare form of pancreatic cancer, which he first announced that he was suffering from in 2004. In 2009, he had a liver transplant though in August this year was forced to step down from his position as Apple CEO.

Since January 2011, Jobs had been on a medical leave of absence, only returning to front-line duties for the launch of the iPad 2. Tim Cook, at the time the chief operating officer of Apple, took over Jobs' day-to-day duties and after Jobs' resignation took over as CEO.

A private memorial for Apple employees will take place at the company's campus in Cupertino on 19 October, though no pbulic services will take place.