The Tennessee Supreme Court has upheld the kidnapping and murder convictions of a Fariview woman serving life for killing her husband’s ex-wife in Dickson County. In a unanimous decision handed down Wednesday, the court rejected 49-year-old Kimberly Mangrum’s claim of prosecutorial misconduct during grand jury testimony that led to her indictment for the 2002 murder of LeeAnn Mangrum, the ex-wife of Terry Mangrum Sr. Lawyers for Kimberly Mangrum argued before the state’s high court in October that prosecutors improperly used the grand jury process as an investigatory tool to obtain a more serious charge against their client. Kimberly Mangrum was eventually convicted of felony murder, attempted first-degree murder, especially aggravated kidnapping and aggravated burglary and sentenced to life in prison. She will be eligible for parole in 2061. LeeAnn Mangrum’s son, Terry Mangrum Jr., who was 17 at the time of the murder, testified Kimberly Mangrum beat LeeAnn Mangrum with a baseball bat until she was unconscious, then forced pills down her throat and made him hold her underwater in Turnbull Creek until she died. The son said Kimberly Mangrum had a history of violence, burning him with cigarettes, and threatened to kill him and his younger sister if he didn’t help or told anyone. In a decision written by Chief Justice Gary R. Wade and released Wednesday, the court held that “prosecutorial abuse of the grand jury process occurs only when the dominant purpose of a grand jury proceeding is to investigate a defendant for an offense for which he or she has already been indicted.” The court said Kimberly Mangrum failed to show that any such misconduct had taken place and confirmed her convictions. Mangrum’s lawyers said prosecutors abused the system when they granted her step-daughter immunity to testify before the grand jury.