I remember even less about this one than the one I previously asked for, so be warned!
It's an alt universe fic and the few things I remember are it was Tempus who killed Clark's parents when he was 10 (he popped in and out) and I think Tempus may have assassinated the president? I remember Lois and Clark in a government office solving the "mystery' when the secret service, etc couldn't? Tempus was in one frame of the footage, I think. He stepped through his time window and stepped back in and nobody could figure out who fired the shot.
Does that sound familiar to anyone?
Does that sound