According to the Publishers Weekly Twitter account, American author Tom Clancy died Wednesday in a Baltimore hospital at age 66.
— Publishers Weekly (@PublishersWkly) October 2, 2013

The New York Times is also confirming:

Tom Clancy's publisher confirms to the NYT that he died last night in a hospital in Baltimore.
— Julie Bosman (@juliebosman) October 2, 2013

"He was a thrill to work with," said Ivan Held, the president of Putnam.
— Julie Bosman (@juliebosman) October 2, 2013

Born in Baltimore, Maryland, and originally an insurance salesman, Tom Clancy went on write technically detailed espionage and military science books.

He is responsible for best-selling books such as "The Hunt for Red October," "Patriot Games," "Clear and Present Danger," and "Rainbow Six."

In 1996, Clancy co-founded the video game developer Red Storm Entertainment and has had his name on several of Red Storm's most successful games.

Red Storm was later bought by publisher Ubisoft Entertainment for an undisclosed sum.

http://finance.yahoo.com/news/tom-clancy...ExSLHAAslHQtDMD

I read a few of his books in the 80's and early 90's. RIP