A woman who used TikTok to publicly pressure authorities to charge her father after her sisters disappearance and presumed death went unsolved for years is finally getting her day in court.

Michael Turney has pleaded not guilty to second-degree murder in the death of his 17-year-old stepdaughter, Alissa Turney, who disappeared on May 17, 2001, in Phoenix. Last week, his trial began, and testimony continued Monday from his daughter, Sarah Turney, who in April 2020 started posting about the case on TikTok after being frustrated that police were not investigating her father.

Shed already posted about her sisters case on several social platforms and launched a podcast , but it was her massively viral TikToks that caught the attention of major media outlets. On Aug. 20, 2020, the Maricopa County attorney announced that Michael, then 72, had been indicted in Alissas death. Her body has not been found.