Elif Shafak said this quote

When you kill someone, something from that person passes to you - a sigh, a smell or a gesture. I call it the curse of the victim. It clings to your body and seeps into your skin, going all the way into your heart, and thus continues to live within you. I carry with me the traces of all the men I have killed. I wear them around my neck like invisible necklaces, feeling their presence against my flesh, tight and heavy. In every murderer breathes the man he murdered.