... There aren't really a lot of limitations on killing. Acceptability is only based on rules of society, and if you don't follow those rules at all then it really doesn't matter.
As for keeping secrets, that's up to you. It depends what you're keeping and who you're keeping it from. Is it important for them to know? If no then there's no real reason that you have to tell anyone anything.
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As for keeping secrets, that's up to you. It depends what you're keeping and who you're keeping it from. Is it important for them to know? If no then there's no real reason that you have to tell anyone anything.