Prosecutors have 30 days to decide whether to move for a new trial or drop the case.
Syed had been serving a life sentence for first-degree murder, robbery, kidnapping, and false imprisonment.
The case was explored in the first season of popular investigative podcastSerial.
Adnan Syed in Baltimore court in 2016.Karl Merton Ferron/Baltimore Sun/TNS via Getty Images
Syed and Lee were seniors at Woodlawn High School in Baltimore County when Lee disappeared in January 1999.
Her strangled body was discovered in a forest three weeks later.
An attorney for Syed didn’t immediately respond to EW’s request for comment.
