Apple said founder Steve Jobs has died, The Wall Street Journal reported late Wednesday.

In August, the legendary chief executive officer of Apple Inc., resigned and the company named Tim Cook, its previous chief operating officer, to the post.

Jobs wrote in a letter to the board that “if there ever came a day when I could no longer meet my duties and expectations as Apple’s CEO, I would be the first to let you know. Unfortunately, that day has come.”

“I believe Apple’s brightest and most innovative days are ahead of it,” Jobs said at the time. “And I look forward to watching and contributing to its success in a new role.”

Jobs was diagnosed with pancreatic cancer in 2004 and underwent a liver transplant two years ago. He reportedly appeared at the iPad 2 launch in March and the annual developers’ conference in June, The Journal reported. But he appeared thin at both events.

Jobs is credited with being the mind behind the iPhone, iPad and other devices that turned Apple into one of the world’s most powerful companies.