Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
The photograph was published in numerous newspapers without copyright notice. No instances were found of it being published with a proper copyright notice. For example:
Uploaded a work by w:United Press International from [https://www.nytimes.com/live/2021/11/17/nyregion/malcolm-x-assassination?action=click&context=breakout_link_back_to_briefing&module&pgtype=Article®ion=header&state=default A timeline of major events in the case since Malcolm X’s death], ''The New York Times'', November 17, 2021 Originally published by United Press International, February 22, 1965 Cropped from the source image to the portion of the photo that was published in 1965...