Long story short, some random [censored] cazador (I think) killed Marcus and now it's ruined my perfect good guy playthrough. I arrived in Jacobstown to find that Marcus had vanished and after a run through of the final quest, I discovered in the ending cinematic that Marcus had died. I don't have any saves to go back to and was wondering if it is possible to respawn him and reset the other npcs that know he is dead. Basically reset it back to a previous state. Is this possible in the middle of the game, or am I completely screwed?

I have already tried this:

prid 0013afde

resurrect

moveto player

But no dice. Marcus is back, but the npcs still acknowledge that Marcus is dead. Any ideas?

I believe once an NPC dies, they will be recognized as such forever. I remember in F3, I accidently killed Nathan and Manya, but resurrected them both but both talk as if each other are dead. If you needed Marcus for a quest, you need to open the console and reset it.