[In all honesty she isn't positive. She's never asked him about his crimes before. But...considering what he is, she can take a guess. It doesn't matter who you are killing. Killing, in the warden's eye, is still killing.
Her smile isn't amused as she speaks next.]
Apparently we're replaced once we disappear here. [She doesn't appear as though she believes her words, however.] Time works differently between home and the prison. At least that is what the warden says.