Clancy passed away in a Baltimore hospital near his Maryland home; at this point the cause of death is unclear.
Clancy was famous for writing historically and technically accurate novels. He sold his first book, "The Hunt for Red October," to Naval Institute Press for a mere $5,000. Not only did the novel sell over five million copies, it served as the basis for the hit 1990 film by the same name, which starred Sean Connery and Alec Baldwin (as Jack Ryan, who ended up being featured in in eight of Clancy's novels).
"The Hunt for Red October" ended up grossing $200.5 million globally, on a budget of $30 million -- and remember, those are 1990 dollars. The novel, meanwhile, was one of Naval Institute Press' first fictional publications, and is still their most successful.
A new Tom Clancy novel, "Command Authority," is scheduled for release on Dec. 3. This novel is co-authored by Mark Greaney.
In addition, a new film, "Jack Ryan," will continue the adventures of Clancy's favorite character. Previously played by Baldwin, Harrison Ford, and Ben Affleck, this incarnation of the character will be portrayed by Chris Pine ("Star Trek Into Darkness").