Stepbrother charged with murder months after 18-year-old found dead on cruise ship

We're learning today the stepbrother of an 18-year-old found dead during a family cruise [music] vacation is now being charged with assaulting and killing her. You may remember the story, Anna Keaptainner, who you see here. She was found dead in early November.A medical examiner found she'd been strangled to death. Her 16-year-old stepbrother is now being prosecuted, by the way, being prosecuted as an adult. He's facing murder and sex abuse charges.Prosecutors say Kener's murder was premeditated. NBC News h ...