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(CNN) — A Baltimore judge has granted a new trial for Adnan Syed, the man who was convicted of murder in 2000. Syed’s case was the focus of Season 1 of NPR’s popular “Serial” podcast.

Syed was a senior in high school when he was arrested in 1999 in the killing of his ex-girlfriend Hae Min Lee. In the original case, prosecutors argued that two incoming phone calls made to Syed’s cellphone placed him at the site where Lee’s body was buried.

Syed’s attorney presented a motion saying AT&T, the company that provided cellular data for Syed’s cellphone, warned prosecutors that incoming calls were not considered reliable for location.

Baltimore Circuit Court Judge Martin Welch said in the order that there was “alleged ineffective assistance for the failure to cross-examine the State’s cell tower expert about the reliability of cell tower location evidence.”

You can read the judge’s order by clicking here.