A teenager charged with sexually assaulting and killing his 18-year-old stepsister on a Carnival Cruise ship has surrendered after a federal judge reversed his decision on pretrial release now that the teen is charged as an adult

The 16-year-old suspect was ordered to report to the federal courthouse in Tampa earlier Monday morning, where his family would deliver him to the U.S. Marshals' custody.

A teenager charged with sexually assaulting and killing his 18-year-old stepsister on a Carnival Cruise ship has surrendered after a federal judge reversed his decision on…