Tim Cook regularly visited Steve Jobs at his home during his illness

Apple chief executive Tim Cook offered a part of his liver to a dying Steve Jobs, according to a new book due to be released this month

The book, Becoming Steve Jobs, excerpts of which have been published online, throws light on life inside Apple as it grew into one of the world's most powerful technology companies.

It also charts the relationship between Mr Cook and Mr Jobs.

According to the book, Mr Jobs angrily turned down Mr Cook's offer.

In 2004, Mr Jobs announced that he was suffering from pancreatic cancer and by 2009, the Apple chief executive was very ill, unable to come into the office and waiting for a liver transplant.