The state of Mississippi has officially closed an infamous case involving the murders of three civil rights workers, including two who were from New York City.

New Yorkers Michael Schwerner and Andrew Goodman were killed in 1964 along with Mississippi native James Chaney as they were working to register African Americans to vote.

Mississippi State Attorney General Jim Hood said there is insufficient evidence to pursue charges against two men accused of the murders.

The two men were part of a group of seven Ku Klux Klan members believed to have killed the three volunteers.

Even though the case is now closed, Goodman's brother told NY1 he is still fighting to keep Andrew's work alive.

"The Attorney General said the case was closed as a legal matter it's closed but as a social matter there's nothing closed about it,” David Goodman said. “It's still open and we're still working to make our Union a more perfect democracy."

Only one man was ever tried for murder in the case.

Edgar Ray Killen was convicted of manslaughter in 2005 and is currently serving a 60-year prison sentence.