I have no specific evidence pointing to the fact that "Grant did it" and Amanda was associated by default.
I have a gut feeling.. I know because, you can tell in his "Songs" that he literally had wet dreams about killing Laura..
I cant imagine a scenario where AH would actually be the one to finally *Snap
I knew Grant, I've interacted with him on a few occasions.. I never liked him initially, but eventually I had to be cordial.. because I kept running into him.. the Raleigh Nightlife scene was small (everyone knew everyone) there was maybe 1 degree of separation from everyone in the town..
Anyway the last time I spoke with him, I was leaving a bar, and walking to another one.. when I decided to cut through the parking lot where grant was hanging out with one of his band-mates..
Grant for some reason decided to bring me into his conversation about his disdain for Laura.. which in my opinion..was quite elaborate.. i couldn't understand why someone would hold such anger for a person that they just "married". his dialogue about her was basically him calling her "white trash from the cornfields of Iowa, "a reject hick who's own family abandoned her", he touched on the fact that "None of her family came to the wedding" and that she was generally not a person deserving of his presence.. (or much less his kids)
his dialogue in general was consistent with all of the evidence, the "songs" and the ridiculous ego he's been stroking..
ever since that day, I knew (without speaking to either of them for another year) that it was probably a very unhappy relationship filled with arguments and bitter fights.
There's only one person that could have possibly killed her.. she had no enemies. and nobody had enough anger, rage, or otherwise disdain for her like Grant did.