A construction worker who became a witness in a federal workplace safety investigation after he was injured during the collapse of a new Hard Rock Hotel in New Orleans was deported by immigration authorities Friday, his lawyers said. The worker, Delmer Joel Ramirez Palma, had to scramble to stay alive while metal and debris rained down and parts of the 18-story structure pancaked around him and killed three of his colleagues on Oct. 12. Mr. Ramirez Palma had raised concerns about problems with the construction with supervisors multiple times, according to his lawyers. After the building crumbled around him, he...