Billionaire businessman David Koch, one of the richest men in the world and a prominent Republican party donor has died.
'Sources close to the family say David Koch has died,' New Yorker reporter Jane Mayer tweeted on Friday morning.
Details about the time, place and the circumstances surrounding the 79-year-old's death are currently unclear.
He and his older brother Charles, 83, have been among the biggest donors to the GOP since the 1980s. The brothers built their fortune from the company Koch Industries, which refines crude oil and is the maker of Dixie cups and Quilted Northern toilet paper.