It's been 46 years since Malcolm X was gunned down in New York. The details were always murky. As CBS News national correspondent Jim Axelrod reports, a new biography of the controversial activist shines a new light on his murder and has sparked a new call for justice.

"Malcolm X: A Life of Reinvention," the new book by Columbia University professor Manning Marable, outlines why the investigation should be reopened. Marable died last week, just before publication.

Zaheer Ali, Marable's chief researcher, said, "Professor Marable believed in justice. And his killers were never served justice."