Asia McClain, the star witness in the Adnan Syed trial made famous by NPR's "Serial" podcast, spoke out publicly for the first time Wednesday, emphasizing that she doesn't know whether Syed -- who was convicted as a teenager in 2000 of murdering his ex-girlfriend, Hae Min Lee -- actually committed the crime.

“Do I think Adnan killed Hae? Honestly, I couldn’t tell you," McClain told ABC's "Good Morning America."

"By coming forward, I hope that I was able to provide enough information to the judge for him to be able to make a rational decision," she added. "Whatever that might be is in his hands."

Syed's post-conviction hearings, which came to a close Tuesday in Baltimore, centered around McClain, a former classmate of Syed's and a potential alibi witness.

McClain was never contacted when Syed was first tried. But as "Serial" host Sarah Koenig has pointed out, she may be in a position to prove Syed's innocence. McClain says she was with Syed at the time that prosecutors say he killed Lee.

"I was sitting in the library bored to tears and someone walked in that I knew," McClain told ABC. "I asked him about his breakup with Hae, she was dating someone else but that he just wanted her to be happy. He didn’t seem to be disturbed or angry with her."

Syed's attorney C. Justin Brown said Tuesday that the decision not to include McClain's testimony in Syed's original trial was a mistake. She "could've turned this trial around," he said.

Before "Serial," "I didn't think I was very important at all," McClain testified this week. "I came to find out... maybe it is important."

Millions of people became familiar with Syed's story in 2014 via NPR's podcast. He was arrested and sentenced to life behind bars for Lee's murder, but the case was rife with inconsistencies and unanswered questions.

Syed has maintained that he is innocent. His appeal attempts were repeatedly denied until November, when a judge ordered that his case be reopened.

A judge will now determine if Syed will receive a new trial.

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