CNN —The FBI is investigating the “suspicious death” of a female passenger onboard the Carnival Sunshine cruise ship, the agency announced in a news release Sunday. The woman was found unresponsive during the ship’s February 27 voyage to Nassau, Bahamas, the FBI field office in Columbia, South Carolina, said. Medical staff and crew members attempted life-saving measures after learning she was unresponsive, but the woman was pronounced dead on the ship, the FBI said. On March 4, when the ship returned to Charleston, an FBI team processed the passenger’s room for evidence, the FBI release states. The FBI investigates suspicious deaths of US nationals as well as “certain crimes on the high seas,” the release states.