If someone who has a siamese twin commits murder, are they still punished?

[ArtMonkDrillz]

Originally Posted by mooby

What Quake said. Since you know the twin had been there and couldn't stop it, that twin would most likely be charged as an accomplice.

What if for some reason she couldn't stop it, and so she was the one who tells the police and rats her sister out?

As random and weird as this question is, I think it's actually pretty interesting.