Then known as Alexandra McCabe, Ms. Reade testified as a government witness in Monterey County courts for nearly a decade, describing herself as an expert in the dynamics of domestic violence who had counseled hundreds of victims.

But lawyers who had faced off against her in court began raising questions about the legitimacy of her testimony, and the verdicts that followed, after news reports this week that Antioch University had disputed her claim of receiving a bachelor’s degree from its Seattle campus…

Roland Soltesz, a criminal defense lawyer, says he believes Ms. Reade’s testimony made a significant difference in the outcome of the 2018 trial of his client Victoria Ramirez. Both Ms. Ramirez and her co-defendant, Jennifer Vasquez, received life sentences for attempted murder, arson and armed robbery.

“People have been convicted based upon this, and that’s wrong,” said Mr. Soltesz, adding that he “could care less about the politics of this whole thing.”