Originally posted by AppleOnYa: Personally, I've come to the conclusion that it was Anthony who killed the 'would-be' assasins at the Tahoe compound.
Remember how, only moments earlier he says, "Maybe I can help you...", while Michael visits him in his bedroom. Upon hearing the shots and realizing they were aimed at his parents, Anthony then decided this was his big chance to prove himself. So he ran to his closet, grabbed the rifle Neri had secretely given him for his birthday, blew the culprits away from his own window, then slipped innocently back under the covers. Notice how withdrawn Anthony appears throughout the remainder of the film. He is obviously suffering from guilt at having murdered for the first time, but also a little dejected, because here he's made his bones and can't tell anyone about it!!
This also helps to explains how, in GFIII the adult Anthony wants no part of the Corleone Family business, and is drawn instead toward a career in the Fine Arts.
Apple
I like this theory, I think I join up with this marvelous one.
I think Fredo was to weak, but I couldn't think of anyone else. And this theory is maybe a very good explanation.