John Dylan Adams was already in jail on charges that he helped dispose of evidence in Bobo's murder was indicted by a grand jury on two counts for allegedly participating in her rape on the same day she disappeared.
The 26-year-old admitted to the rape when he was arrested for allegedly destroying evidence relating to her murder, according to the Tennessee Bureau of Investigation.
His brother Zachary Rye Adams and another man are accused of killing Bobo whose body was not found until three years after she went missing in April 2011.