To be honest, I was also having my doubts about Rolo being the murderer and also thought about the whole 'she got the gun in her hand' blablabla Also, Rolo is such an overly obvious culprit, knowing how protective he is of his 'brother', that the fact they didn't show the actual murder scene made me suspicious. But... ...there is one thing that made me strongly believe he really might be 'the one' = the mask falling on the ground right after Rolo activated his Geass. + the locket (I hope we will get to see what is inside). I think it symbolized that Rolo showed his 'true colors'...and killed a possible danger to Lelouch and himself...or not, he might have 'tolerated' Shirley helping them but the moment Nunnaly came up she was a goner... Something else: who could have killed her? She didn't suicide, Suzaku is not the one either, and I can't think of any character who would have any interest in murdering her either. And then, what do you suggest Rolo did after suspending the Time with his Geass: he just walked off on her...?
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Also, Rolo is such an overly obvious culprit, knowing how protective he is of his 'brother', that the fact they didn't show the actual murder scene made me suspicious.
But...
...there is one thing that made me strongly believe he really might be 'the one' = the mask falling on the ground right after Rolo activated his Geass. + the locket (I hope we will get to see what is inside).
I think it symbolized that Rolo showed his 'true colors'...and killed a possible danger to Lelouch and himself...or not, he might have 'tolerated' Shirley helping them but the moment Nunnaly came up she was a goner...
Something else: who could have killed her? She didn't suicide, Suzaku is not the one either, and I can't think of any character who would have any interest in murdering her either.
And then, what do you suggest Rolo did after suspending the Time with his Geass: he just walked off on her...?