"But one of Malcolm's top aides, Leon 4X Ameer, went to the FBI,
about, I think it was ten days after Malcolm was killed, and
indicated that he felt that there were elements not only within the
Nation of Islam proper, but within the US government that were
behind Malcolm's assassination. He then was found dead, himself,
a few days later at the age of 32 in his apartment in Boston.
Initially, they said it was suicide, then they changed that to a
drug overdose, but the final disposition of the case was that he
died of natural causes, despite the fact that he was in good health
at the age of 32. It is worth noting that Ameer took his wife and
child and relocated them from Boston prior to his death, because he
felt that his life was in danger and he did not want his wife and
child to die if and when the assassins came for him. That is still
the official version of the death of Leon Ameer, namely, natural
causes at the age of 32 within ten days of (actually it was about
a week) having visited the FBI and voiced his suspicions about U.S.
governmental involvement in the assassination of Malcolm X."

I know a woman from the family who hid one of these men. I know that he was found dead, so perhaps it's the same person.