Article continues below advertisementThe 16-year-old stepbrother of Florida cheerleader Anna Kepner is the prime suspect in her murder, according to new reports. Kepner's lifeless body was discovered by a housekeeper under a bed in the cabin she was sharing with her stepbrother aboard a Carnival Cruise ship last November. It's now been revealed in court documents obtained by CBS News that the boy, who was reportedly obsessed with his stepsister, is facing homicide charges. Article continues below advertisementSource: @fl.