NEW YORK — Caleb Carr, the scarred and gifted son of founding Beat Lucien Carr who endured a traumatizing childhood and became a bestselling novelist, accomplished military historian and late-life memoirist of his devoted cat, Masha, has died at 68. Carr died of cancer Thursday, according to an announcement from his publisher, Little, Brown and Company. [time-brightcove not-tgx=”true”] A native of Manhattan, Caleb Carr was born into literary and cultural history.