Herman Cain, a former Republican presidential candidate and supporter of President Donald Trump who pointedly refused to wear a mask during the coronavirus pandemic, has died after contracting Covid-19, his website said.
Cain (74) learned of his diagnosis on June 29, nine days after attending a Trump rally in Tulsa, Oklahoma, where he and many others crowded together without wearing face masks aimed at preventing the spread of the novel coronavirus.
He spent most of July in an Atlanta-area hospital.
"Herman had an incredible career and was adored by everyone that ever met him, especially me. He was a very special man, an American Patriot, and great friend," Mr Trump wrote on Twitter.
Many Trump supporters have rejected the advice of public health experts and refused to wear masks, which can prevent the spread of the virus, making their defiance a type of political statement.
Just before announcing his diagnosis on July 2, Mr Cain posted support for not mandating masks at a July 4 event at Mount Rushmore in South Dakota that Trump was planning to attend.
"Masks will not be mandatory for the event, which will be attended by President Trump. PEOPLE ARE FED UP!" he tweeted.
Messages of condolence poured in from prominent conservatives, while some liberals used the occasion to promote the wearing of masks.
"Herman Cain will be missed, he was one of the greatest conservative voices of all time. I'll never forget his smiling face," Jenny Beth Martin, of the Tea Party Patriots, wrote on Twitter.
Mr Cain, who called himself an ABC man - 'American Black Conservative' - had just started hosting a TV show and hoped to play a role in the 2020 presidential election campaign, the statement said.
He made his fortune as chief executive of Godfather's Pizza, a restaurant chain, and led some opinion polls early in the race for the 2012 Republican presidential nomination.
During the 2016 presidential campaign, he became a supporter of Mr Trump, who last year planned to nominate Mr Cain to a seat on the powerful US Federal Reserve Board, which sets benchmark interest rates.