Allen died on Monday in Seattle from complications of non-Hodgkin's lymphoma, according to a statement from Vulcan Inc., his investment firm. Allen's source for his varied investments and sizable charitable donations was his once-major stake in Redmond, Washington-based Microsoft. He had a net worth of $26.1 billion, according to the Bloomberg Billionaires Index.
He stepped down as an officer of the company in 1983 because he was grappling with Hodgkin's lymphoma. In 2009 Allen was treated for non-Hodgkin's lymphoma, which in October 2018 he said had returned.