The Tennessee governor, Bill Haslam, has granted clemency to a woman serving a life sentence for murder who says she was a victim of sex trafficking and who has been supported by celebrities including Rihanna and Kim Kardashian West.

The Republican governor, whose term ends in two weeks’ time, chose to show mercy to the now 30-year-old Cyntoia Brown by releasing her on 7 August this year. Brown was sentenced to life in prison for killing a man when she was 16.