[sexypanda]

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I can not justify taking someone else's life even if it means letting someone I love die.

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I can justify taking someone else's life... even if no loved one's are involved: self-defense, euthanasia.

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Fair enough: I think good arguments can be made for killing someone in the two examples listed. Can you give a justification for killing someone who (1) hasn't infringed on your rights at all and (2) hasn't consented to your taking their life?

I don't think you have offered an example which refutes the previous poster's claim: that it is not moral to kill someone based solely on utilitarian calculations of what is best for society.

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Yes, defense of a friend is a perfectly justifiable defense for killing someone. That person would have neither infringed on your rights, nor consented to you taking their life. This can be said to be utilitarian because infringment on anyones rights is a harm to society and tears at the foundation of social laws. When someone infringes on anyone elses rights, they are a threat to the fabric of society, and thefore it is justifiable to stop them from doing so (appropriately according to the situation) for the good of society. If that person is trying to kill another, you are then justified in killing them.