Anna Kepner, a teen who died aboard a Carnival Horizon cruise ship earlier this month, was found dead under a bed, wrapped in a blanket and covered by life vests, according to a security source briefed on the investigation. The 18-year-old cheerleader from Titusville, Florida, was reported dead while aboard the Carnival Horizon cruise ship on Nov. 8. The Miami-Dade medical examiner has not specified a cause or manner of her death. Among the avenues investigators are looking at is whether there might have been some sort of altercation with her stepbrother prior to her death, the source told ABC...