Yes, maester Aemon dies in the story of 'A Feast for Crows.' Before dying, he learns of Daenerys and her dragons and tells Samwell to look into it as he believes she is the child of prophecy. He dies, and Samwell holds the prayer for him. After the prayer, Samwell and Gilly talk and then have sex. Samwell starts feeling guilty as Gilly calls him her husband, but Kojja threatens him, and he continues. When Samwell reaches the Citadel, he inquires about Daenerys and learns she is in Slavers Bay.