The predawn attack took place at the president’s private home. He was shot to death and his wife wounded. It’s not clear who pulled the trigger. The latest suspects identified in the sweeping investigation included a former Haitian senator, a fired government official and an informant for the U.S. government. Miami has become a focus of the probe. The city has long been a nest of intrigue, from being a CIA recruitment center for the failed Bay of Pigs operation to overthrow Cuban dictator Fidel Castro to being a key shipment point for Colombian cocaine in the 1980s. Its palm-fringed shores have also been a place of exile for people from Latin American and Caribbean countries when political winds blew against them at home, and where some plotted their returns.