A 16-year-old Florida boy, identified as "T.H.," is being prosecuted as an adult in connection with the murder and sexual assault of his stepsister, Anna Kepner, during a family cruise last year. The U.S. Attorney's Office for the Southern District of Florida announced that a federal grand jury had indicted the suspect, charged with first-degree murder and aggravated sexual abuse. If convicted, T.H. faces a maximum penalty of life in prison. KEPner, 18, was found dead under a bed in a cabin the siblings shared on the cruise ship. The FBI is investigating the case as the alleged crimes occurred on the "high seas," or international waters, and involve the purported victim as a U.