The police are investigating a 16-year-old boy in the death of his stepsister, Anna Kepner, on a Carnival cruise ship last month. However, he claims he has no recollection of what happened. That's the update according to text message exchanges between his parents. The court got access to the texts after they were included in a custody court case in Florida.RELATED: Prayers Up! Big Brother Star Mickey Lee Dies At 35 After Health Crisis As Family & Co-Star Speak Out (PHOTO)What Happened To The Stepsister Anna Kepner?Anna Kepner's death was ruled a homicide.