The thing is, I found the leader in one of the towers that I'd already killed before. He/She was still the same glowing pile of ash. However, the ash pile contained two of Red Eagle's swords, another quest I'd already done. I didn't get a prompt to return to Markarth but did get one to learn the secret of Red Eagle (again). So I thought, Okay, I'll do that again and see if it prompts to return to Markarth to report that the Forsworn leader at Red Eagle redoubt was dead. So I go unlock the cave where I'd killed Red Eagle before. He was as dead as the last time I saw him.
So then I went back to Markarth to see if everything was in order. It wasn't.
So now what? Do I just have to wait it out for X amount of time for the Forsworn leader at Red Eagle Redoubt to respawn or is the quest broken due to the fact that I'd already killed him? Or is there some other feature that I'm missing. The problem with the last idea is that the ash pile is where my arrow prompted me to look.
Any info would be greatly appreciated. Thanks.
P.S. I play on XBOX 360 if that makes a difference.