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Morni, maybe, but this article only mentions Gil's nickname and the attempt on his life, and it was Thor who killed him. Besides, the killer is planting his own clue, not the GM. What do we know about planted clues? That they remain even if the assassination fails. Therefore, I'm more inclined to think that this is a clue pointing to Thor, even though I don't know how to connect it to him. Maybe I'm wrong...
Added 1 minute ago
But I would check Slonysha anyway, as there are no other suspects yet.
Added 2 minutes ago
Besides, the phrase "making it look like an accident" suggests that there shouldn't be any clues left.