He retired from Koch Industries and his family’s political network last year.

David Koch, a giant of philanthropy and the libertarian movement, has died.

David Koch, one of the United States’ richest men and a longtime political power player, has passed away at 79 years old, according to the New Yorker.

Along with unloading his fortune into conservative causes, Koch turned heads with his real-estate purchases — even paying for one townhouse in cash.

Along with unloading his fortune into conservative causes, Koch turned heads with his real-estate purchases — even paying for one townhouse in cash.

Koch lived in an $18 mil. Park Avenue duplex, paid cash for a $40 mil. Manhattan townhouse, and had a mansion on the Hamptons' "Billionaire Lane."

Koch lived in an $18 mil. Park Avenue duplex, paid cash for a $40 mil. Manhattan townhouse, and had a mansion on the Hamptons' "Billionaire Lane."

Jane Mayer, a reporter for the New Yorker who profiled Koch, said Friday morning that Koch had died. A later statement confirmed it.

Charles and David Koch have been titans in industry and politics for decades. David Koch died at age 79.

Jane Mayer, a reporter for the New Yorker who profiled Koch, said Friday morning that Koch had died. A later statement confirmed it.

Charles and David Koch have been titans in industry and politics for decades. David Koch died at age 79.

Chase Koch, nephew of David, is next in line for the Koch network and family fortune. He isn't as focused on conservative politics as his family is.

Chase Koch, nephew of David, is next in line for the Koch network and family fortune. He isn't as focused on conservative politics as his family is.

Billionaire Republican megadonor David Koch is stepping down from his roles at Koch Industries, the Americans for Prosperity Foundation, and other organizations, according to announcements on Tuesday.

David Koch, one of America's richest businessmen and largest political donors, says he is just fine with giving money to candidates who hold different social views than he does because its his economic concerns that matter most.

Philanthropist Julia Koch, the widow of billionaire industrialist David Koch, has sold the couple’s Manhattan townhouse for $41 million in an off-market deal. https://t.co/cn9D6GR3Tu via @WSJ

RT @lawofruby: BIGGER CARROLL UPDATE: DOJ tells Judge Kaplan it will NOT certify the first Carroll case under the Westfall Act, leaving Tru…

RT @terry_jepson: @CoffeeBean26 American For Prosperity is funded by billionaire Charles Koch and formerly his brother David (deceased). Re…

RT @_Prometeusz_: @c_plushie @reason @RobertKennedyJr "[David] Koch was for 36 years a trustee of the Reason Foundation, which publishes Re…

RT @terry_jepson: @CoffeeBean26 American For Prosperity is funded by billionaire Charles Koch and formerly his brother David (deceased). Re…

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RT @leghorn1357: Who is this bigot?

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RT @the_cognizer: Will we eventually unravel the neural basis of consciousness? Given the fast technological advancements in 1998, Christof…

RT @ReallyAmerican1: THIS IS RICH: In recent days, Donald Trump seems to have a BILLION problems, and a Koch is one of them. Charles and Da…

RT @ReallyAmerican1: THIS IS RICH: In recent days, Donald Trump seems to have a BILLION problems, and a Koch is one of them. Charles and Da…

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RT @FrankMikeDavis1: Currently, our ONLY "legitimate" SCOTUS Justices. ...Agree ??? https://t.co/0Zi5TjdK5I

RT @dijoni: make no mistake. This is state sponsored terrorism, using a dog to torture and black man that is not a danger to the police . T…

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RT @JRHorsting: Ginni & Clarance are now part of the Arizona Trump vote fraud investigation. These are serious crimes against the country.…

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RT @ReallyAmerican1: THIS IS RICH: In recent days, Donald Trump seems to have a BILLION problems, and a Koch is one of them. Charles and Da…

RT @sprzyslp: @espinsegall @froomkin @steve_vladeck #SCOTUS6 are way beyond conservative.They are Opus Dei(RW Catholicism)& Barrett is Peop…

RT @JazzyJ87283918: When will this woman and her right wing backers be charged for lying to the Supreme Court? https://t.co/8z9MlBrU0J

The #SCOTUS is kowtowing to their hyper-wealthy bribe masters that are heavily invested in the very lucrative student loan industrial complex. It's the only investment that can not be diluted by bankruptcy laws. Student loans are given to kids who have no concept regarding debt. https://t.co/bSVFOiM3DG