A grand jury in Mississippi has declined to indict the white woman whose accusation set off the lynching of Black teenager Emmett Till nearly 70 years ago, despite revelations about an unserved arrest warrant and an unpublished memoir by the woman, a prosecutor said Tuesday.

"The prosecutor tried his best, and we appreciate his efforts, but he alone cannot undo hundreds of years of anti-Black systems that guaranteed those who killed Emmett Till would go unpunished, to this day," Parker said in the statement.

Donham said in the manuscript that the men brought Till to her in the middle of the night for identification but that she tried to help the youth by denying it was him.

"No family should ever have to endure this pain for this long," Parker said in his statement to CBS News Tuesday.

Justice Department last year said it was ending its investigation into Till's killing.

The Justice Department in 2004 had opened an investigation of Till's killing after it received inquiries about whether charges could be brought against anyone still living.

The department said the statute of limitations had run out on any potential federal crime, but the FBI worked with state investigators to determine if state charges could be brought.