Treja Kelley had been hesitant to come forward after witnessing the murder of her 17-year-old cousin. But she found the courage to take the stand last year and helped secure a guilty verdict. Her testimony, though, put a bounty on her head, prosecutors said. Just a few months after testifying, Kelley was shot dead in September 2019, not far from where her cousin had been slain. She was 18 and pregnant.