FBI investigating stepsibling in teen's death on Carnival cruise, court filing says

The mystery deepening around the tragic death of a teenager aboard a cruise ship. >> This is the port where the Carnival Horizon ship returned to Miami after Anna Keaptainner died almost 2 weeks ago. The FBI responded to the scene.But almost 2 weeks later, the Miami date medical examiner still has not announced a cause of death for the 18-year-old. Meanwhile, new details are potentially emerging. NBC News has obtained a filing from this week by an attorney for the teen's stepmother, Shaun Tel Hudson.And to ...