The Brooklyn district attorney's office is creating a special 12-member panel to help review 50 cases involving retired NYPD Detective Louis Scarcella.
Prosecutors have been going over cases led by Scarcella, and want to make sure 40 convictions he helped with still stand.
The investigation began two months after a judge overturned one of Scarcella's most high-profile cases.
David Ranta spent 20 years behind bars for the 1991 murder of a prominent Brooklyn rabbi, but his conviction was thrown out after investigators found his confession was coerced.
They also had major concerns about witness accounts.
Scarcella, seen above, was the lead investigator.