After 30 years in jail, Brian Scott Lorenz thought he might be going home. Last summer, an Erie County judge threw out his conviction in a 1993 murder that had set off a raft of accusations involving bad cops, famous killers and prosecutorial misconduct.

Nearly a year later, the crime is still unsolved and Mr. Lorenz remains behind bars.

In 1994, Mr. Lorenz and a co-defendant were found guilty of the savage slaying of a young mother, Deborah Meindl, in the Buffalo suburb of Tonawanda. Last August, a state judge set aside the conviction, citing DNA taken from the crime scene that did not match either defendant and the fact that prosecutors had not revealed evidence to the defense.

But the Erie County district attorney’s office continues to appeal the overturned convictions, raising the prospect of a second trial despite a paucity of physical evidence or potential prosecution witnesses. And the district attorney has successfully fought efforts to release Mr. Lorenz, who has spent more than half his life behind bars for a crime he insists he did not commit.

“It just seems like it’s never going to end,” Mr. Lorenz, 54, said in a recent interview from jail in Erie County. “I’m on a treadmill, in a tunnel, with the light at the end. But it’s just not getting nowhere, man.”

James Pugh, Mr. Lorenz’s co-defendant, was released on parole in 2019. But the trial judge and an appellate judge in Rochester refused to intervene to release Mr. Lorenz pending another possible trial. In late June, his lawyers asked the chief judge of the Court of Appeals, New York’s highest court, to intervene. A spokesman said the court would “decide the motion at a future session.”

Ilann Maazel, one of Mr. Lorenz’s lawyers, called his client’s continued imprisonment a “Kafkaesque nightmare” that is “intolerable, unconstitutional and wrong.”