FERGUSON, Mo. — He criticized the media. He talked about witness testimony that didn’t match physical evidence. And he did it at night, as a city already on edge waited to learn if a grand jury would indict a white Ferguson police officer in the shooting death of an unarmed black 18-year-old.

St. Louis County Prosecutor Bob McCulloch — whose impartiality has been questioned since soon after Michael Brown was killed by Officer Darren Wilson on Aug. 9 — has come under renewed scrutiny since he appeared before television cameras to announce that the grand jury would not indict Wilson. A defensive McCulloch repeatedly cited what he said were inconsistencies and erroneous witness accounts. He never mentioned that Brown was unarmed.

Attorneys for Brown’s family and activists said Tuesday that everything from how evidence was presented to the grand jury to the way McCulloch delivered the news of its decision bolstered their belief that the outcome was predetermined by McCulloch, who has deep family roots and relationships with police.

“This grand jury decision, we feel, is a reflection of the sentiment of those that presented the evidence,” Anthony Gray, an attorney for Brown’s family, said at a news conference.

Gray questioned, for example, why prosecutors presented testimony of witnesses who clearly did not see the shootings, rather than make a case for some type of charges. He also said it was unclear how the evidence was presented.

Activists and Brown family attorneys had asked McCulloch — whose father, a police officer, was killed while responding to a call involving a black suspect — to appoint a special prosecutor.

He instead asked a grand jury to decide if there was enough evidence to bring charges, and assigned prosecutors in his office to present the evidence because he was “fully aware of unfounded but growing concern that the investigation might not be fair,” he said Monday.

McCulloch said the jury of nine whites and three blacks met on 25 separate days over three months, hearing more than 70 hours of testimony from about 60 witnesses, including three medical examiners and experts on blood, toxicology and firearms and other issues.

“The duty of the grand jury is to separate fact from fiction,” McCulloch said, adding that the panelists were “the only people that have heard and examined every witness and every piece of evidence.”