David Koch, industrialist, political activist and philanthropist, has died at age 79.
He'd reportedly been in declining health with advanced prostate cancer.
David and his surviving brother Charles jointly ran Koch Industrities, one of America's largest privately held businesses, with interests in a wide range of commodities and products.
In 1991, David Koch survived a plane crash, that killed 34 people.
Later, he told New York Magazine that - quote - "I felt that the the good Lord must have spared me for a purpose." That purpose included promoting his libertarian vision of conservative politics.
The Koch brothers founded Americans for prosperity to advocate for lower taxes and fewer business regulations.
However, David Koch was no fan of Donald Trump, and the group redirected their resources towards more local politics.