Business Insider reports on multiple confirmations that military fiction author Tom Clancy has passed away. He was 66.

Clancy’s fictional work will be known to many gamers who enjoyed titles from Red Storm, the game developer he co-founded in 1996. The studio has developed many titles based on Clancy’s intellectual property, most based on the Splinter Cell, Ghost Recon, and Rainbow Six franchises. Aside from his work in the game industry Clancy’s novels focussed on espionage and military action, and he included highly-detailed technical breakdowns in his writing.

He passed away while in care at a hospital in Baltimore, Maryland.