A helicopter crash-landed Monday afternoon onto the roof of a building in midtown Manhattan and then caught fire, authorities said. One person was killed in the crash, which occurred atop 787 Seventh Ave., a 51-story building located between West 51st and West 52nd streets, at the north end of Times Square. The building, known as the Axa Equitable Center, has tenants including BNP Paribas, Citibank and international law firm Willkie Farr & Gallagher.