One murder does not necessarily change alignment. For the record I believe Miko fell for grossly violating the paladin code, which is usually how paladins fall, since it's much easier than alignment change (and it doesn't hurt that I doubt she was ever truly Good to begin with - I'd call her a Lawful Neutral who claimed to be Lawful Good, and really wanted to be, for whatever that's worth).
ETA: Also they're super good and I think you'd enjoy them, especially How the Paladin Got his Scar in GDGU.
It's a toss up as to which is better between SoD and GDGU, but even OtOoPCs has paladin fun if you're interested in that! Anyway, they're all in black and white, so even if one were, we wouldnt tell. In addition to what other people said. But real answer, no, because the author explicitly said that would have taken away from the impact of Miko's fall. To the best of my knowledge, we never see anyone else fall onscreen.