US billionaire industrialist & conservative activist, David Koch dies at 79

Billionaire industrialist, David Koch, a driving force behind conglomerate Koch Industries who as one of the world’s richest people became a major financier of conservative causes and political candidates, has died at age 79, his brother said on Friday.

Charles Koch, Koch Industries Inc’s chairman, disclosed the death in a statement that touched on his younger brother’s lengthy battle with prostate cancer and his philanthropic contributions to medical research, education and the arts.