BALTIMORE (AP) -As a convicted murderer seeks a new trial in a case spotlighted by the popular “Serial” podcast, an alibi witness who was never before called to testify has cast doubts about testimony from the case’s former prosecutor.

Asia McClain, now known as Asia Chapman, testified Wednesday during a hearing for Adnan Syed, who was convicted of murdering Hae Min Lee and is serving a life sentence. He’s seeking a new trial, claiming that his first attorney was ineffective.

McClain has said she saw Syed at a library during the time when prosecutors allege he was killing his high school girlfriend. But she testified Wednesday that prosecutor Kevin Urick convinced her that Syed was “100 percent guilty” and he later gave deceptive testimony about their conversation.

Chapman has taken the stand for the second day of a three-day hearing to determine whether Syed will be granted a new trial.