What to know about the investigation into a teen's death on a cruise ship

A 16-year-old boy who is under investigation in the death of his 18-year-old stepsister on a Carnival Cruise ship appeared in federal court in South Florida late last week, but the reasons have been obscured because of his age.

Unlike adults, juvenile cases are closed to the public, so there was no explanation why the teen was on the docket at the Miami courthouse or whether he's been charged with a crime. Juvenile cases aren't common in federal court and are often sent to state courts, or the juvenile is tried as an adult...