ABC News October 12, 2022

Adnan Syed case had 'major red flags,' prosecutor says

WATCH: Maryland prosecutor speaks out after dropping charges against Adnan Syed

Marilyn Mosby, State's Attorney for Baltimore City, who made the decision to drop the murder case against Adnan Syed, said on Wednesday that her office’s re-investigation of the case had raised “major red flags.”

“Our review of the case quickly turned from making a mere recommendation for release to a re-investigation to claim actual innocence,” Mosby said on “Good Morning America” on Wednesday, “because there were major red flags.”

Marilyn Mosby, the State's Attorney for Baltimore, appears on Good Morning America, Oct. 12, 2022.

Prosecutors in Maryland dropped charges against Syed, the man who was convicted of killing his former girlfriend in 2000, a case made popular by the 2014 "Serial" podcast that investigated issues with the prosecution.

MORE: Prosecutors drop charges against Adnan Syed, murder case made famous by 'Serial' podcast

Mosby said her office was approached by the public defender’s office about the case.

Evelyn Hockstein/Reuters, FILE
Adnan Syed, whose case was chronicled in the hit podcast "Serial," smiles and waves as he leaves the courthouse after a judge overturned Syed's 2000 murder conviction and ordered a new trial during a hearing at the Baltimore City Circuit Courthouse in Baltimore, Sept. 19, 2022

“As we started to dig into the case, one of the things that we saw was not all the evidence was tested,” Mosby said. “The first round of DNA testing we did didn’t produce results, but following the second round of DNA, we found that there was a DNA mixture of multiple contributors. And they excluded Adnan Syed.”

MORE: 'Serial' podcast subject's conviction should be vacated, prosecutors say

Coupled with the “integrity” of the investigation, there were “so many red flags,” she said.

“This was really the nail in the coffin that assured me, which is why I instructed my prosecutors to dismiss the case yesterday,” Mosby said.

The murder case of Hae Min Lee, Syed's ex-girlfriend, is open and pending, Mosby said.

Mosby said she never listened to the "Serial" podcast.