WASHINGTON HEIGHTS, Manhattan (WABC) — Fifty-six years after the death of Malcolm X, lawyers revealed what they called new evidence of a conspiracy, perpetrated by the NYPD and the FBI to assassinate the Civil Rights activist in Harlem.

Ray Wood was an undercover police officer at the time – his family and their attorney now claim Wood wrote a letter on his deathbed confessing the NYPD and the FBI conspired to kill the Civil Rights activist.

Malcolm X was gunned down in February 1965 in Harlem during a speaking engagement. Wood’s family says in the letter that Wood wrote, he stated his responsibility was to ensure Malcolm X’s security detail was arrested days before the assassination.

The letter further states this move would guarantee Malcolm X not having door security at the Audubon Ballroom where he was killed.

Now Malcolm X’s three daughters, along with Wood’s family and high-profile Civil Rights attorney Ben Crump, are asking for the murder investigation to be re-opened in light of the new evidence.

“So, what we’re trying to do is talk about restorative justice is as lawyers — try to pursue relentless justice,” said Attorney Ray Hamlin. “On behalf of the legacy of Malcolm X, Dr. Betty Shabazz, on behalf of his family his lineage who is here.”

Three Nation of Islam members were convicted in Malcolm X’s murder. Last year the Manhattan DA began a review of those convictions after meeting with representatives of the Innocence Project.

Now, with the new evidence, the DA’s office says “the review of this matter is active and ongoing.”