ORLANDO, Fla. (AP) -- A 16-year-old boy under investigation in the death of his 18-year-old stepsister on a Carnival Cruise ship was in federal court at the end of last week, but the reasons for his appearance at the South Florida courthouse have been obscured because of his age.

Anna Kepner, 18, was found dead aboard a Carnival Cruise ship in November. The stepbrother of 18-year-old Anna Kepner, who was found dead aboard a Carnival Cruise ship in November, was arrested and charged this week in connection with the case, according to Anna Kepner's father, who is the stepfather of the suspect.