US billionaire businessman David Koch dies aged 79

David Koch, a major donor to conservative causes and educational groups, died on Friday at the age of 79.

US billionaire businessman David Koch dies aged 79

REUTERS file photo of David Koch, executive vice-president of Koch Industries

Billionaire David Koch has died at age 79. David Koch was a major donor to conservative causes and educational groups.

A person close to the David Koch family told The Associated Press on Friday that David Koch had died. The person wasn’t authorised to discuss the death and spoke on the condition of anonymity.

Together with his older brother, Charles, the Kochs were best known for a vast political network they built that became popularly known as the “Kochtopus” for its far-reaching tentacles in support of conservative causes.

The brothers founded the anti-tax, small government group Americans for Prosperity.

David Koch was an engineer trained at Massachusetts Institute of Technology (MIT.

David Koch joined Koch Industries in 1970 and served on its board. David Koch was chief executive officer of Koch Chemical Technology Group, a Koch subsidiary.

Charles and David Koch, each with an estimated net worth of $31 billion, tied in fourth place in 2012 on Forbes 500 list of the nation’s richest men.