A New York judge abruptly, and permanently, dismissed over a dozen charges against a former NYPD detective, who was accused of fabricating evidence in criminal cases, after prosecutors admitted that they had repeatedly failed to turn over evidence to the defendant's lawyer before trial.
The prosecutors, who worked for the Manhattan district attorney's Police Accountability Unit, apparently told the court that the failure to turn over evidence was the result of "gross negligence," rather than intentional misconduct. Either way, the judge dismissed the charges "with prejudice," meaning the prosecutor cannot bring those same charges again. 
Because of the statute of limitations, it may not be possible to bring any more charges against the defendant.
The case's lead prosecutor was fired.
Edit to add: It appears that the lead prosecutor was removed from her role as deputy director of the Manhattan DA's Public Accountability Unit, but that she remains an employee of the DA's office. Speculating, it may require a lot of procedure to outright fire a public employee in New York, so they may still be going through the procedural requirements to do so.