Actress and singer Nichelle Nichols, best known for her groundbreaking portrayal of Lt. Nyota Uhura in “Star Trek: The Original Series,” has died at age 89, according to a statement from her son, Kyle Johnson.Actress and singer Nichelle Nichols, best known for her groundbreaking portrayal of Lt. Nyota Uhura in “Star Trek: The Original Series,” has died at age 89, according to a statement from her son, Kyle Johnson.