A daughter of slain black civil rights activist Malcolm X says she is suing the New York City Police Department and other agencies for the 1965 murder.
Ilyasa Shabazz says that US officials fraudulently concealed evidence that he “conspired and executed his father’s assassination”.
He announced the planned legal action at the site in New York where he was fatally shot exactly 58 years ago.
An attorney said the FBI and CIA were also named in the legal filing.
Shabaz, 60, was two years old when she saw her father being gunned down. Three armed men shot him 21 times as he prepared to speak at the Harlem Auditorium.
“For years, our family has fought to get the truth out about his murder,” she said Tuesday at the site, which has since been turned into a memorial site, as she filed claims notices , harbinger of a lawsuit.
At the news conference, Benjamin Crump, the attorney representing the family, alleged that powerful people in the US government had conspired to kill Malcolm X.
He mentioned former FBI director J. Edgar Hoover during his remarks.
Mr Crump said the family of Malcolm X wanted to file a wrongful death lawsuit seeking damages in the range of $100m (£83m).
“It’s not just about triggers,” he said. “This is about those who conspired with those who triggered this dastardly act.”
The NYPD told the BBC it would not comment on pending litigation. The FBI and CIA did not immediately respond to a request for comment.
Malcolm X was a prominent spokesman for the Nation of Islam—which advocated separatism for black Americans—before his acrimonious split from the organization. He was 39 when he was killed.
One man, a member of the Nation of Islam, confessed to killing him.
In 2021, two other men convicted of her murder were indicted after a New York state judge declared it to be a miscarriage of justice.
Both men were later fully exonerated after the New York Attorney General found that prosecutors had withheld evidence that might have cleared them of murder.
The families of the wrongfully convicted sued and won $26m from New York City and $10m from New York State.