Billionaire philanthropist and conservative activist David Koch has died. He was a big Smithsonian donor.

David Koch, conservative activist and billionaire philanthropist who made major contributions to the Smithsonian Institution and sat on the board of several Greater Washington nonprofits, has died at the age of 79.

“While we mourn the loss of our hero, we remember his iconic laughter, insatiable curiosity, and gentle heart,” Koch’s family said in a statement Friday morning.

A cause of death was not given. He was diagnosed with prostate cancer in 1992 and his health had declined recently, resulting in him leaving his business leadership roles.

David Koch retired a year ago from his responsibilities at Koch Industries, including roles as chairman and CEO. Also in that announcement, he said he was retiring from other organizations and getting out of politics.

Koch sat on the board of the Smithsonian’s National Museum of Natural History, which recently debuted its renovated dinosaur and fossil hall exhibit named after him, “The David H. Koch Hall of Fossils — Deep Time.” In 2012, Koch…

Read the full story from the Washington Business Journal.

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