Tony Blankley, a noted conservative author and commentator and former editorial page editor of The Washington Times, died Sunday morning, according to family sources. He was 63 and had been battling stomach cancer.

Mr. Blankley was an executive vice president of the Edelman public-relations firm in Washington, a visiting senior fellow in national-security communications at the Heritage Foundation, a syndicated newspaper columnist and an on-air political commentator for CNN, NBC and NPR.