A 16-year-old boy from Titusville, Florida, has been charged as an adult with the murder and sexual abuse of his stepsister, Anna Kepner, who was found dead aboard a Carnival cruise ship. The indictment reveals that Anna, an 18-year-old cheerleader, allegedly suffered sexual assault before her tragic death. The stepbrother is facing serious charges including murder and aggravated sexual abuse, following the mysterious circumstances surrounding the incident. Authorities state the charges come after months of investigation into this shocking tragedy at sea.