Schoolgirl Anna Kepner, 18, dies aboard Carnival cruise ship traveling from Miami to Caribbean

An 18-year-old schoolgirl has died aboard a Carnival cruise ship sailing from Miami to the Caribbean. Straight-A student Anna Kepner, from Titusville, Florida, died on the Carnival Horizon on Saturday. Further details on how she died have not been released, with the Horizon returning to port after the tragedy. The FBI is investigating her death. Kepner had just started her senior year at high school and was planning on joining the military. 'When she walked into a room, she would light it up,' a relative told ABC News. 'If you were sad, she'd make you laugh. She would joke around and be the funniest little person in school.' 'She had just finished taking the test to join the military,' they added. 'She was already talking to recruiters and had chosen her career path. She wanted to do something that would help her community.' Carnival Cruise Line confirmed her death in a statement to ABC, adding: 'Our focus is on supporting the family of our guest and cooperating with the FBI.