“ I cannot say that it consisted in any one step really—though one, of course, was the step beyond which I could make no return. But there were several acts involved, and the first was the death of the overseer. Lestat took him in his sleep. I was to watch and to approve; that is, to witness the taking of a human life as proof of my commitment and part of my change. This proved without doubt the most difficult part for me. I’ve told you I had no fear regarding my own death, only a squeamishness about taking my life myself. But I had a most high regard for the life of others, and a horror of death most recently developed because of my brother. I had to watch the overseer awake with a start, try to throw off Lestat with both hands, fail, then lie there struggling under Lestat’s grasp, and finally go limp, drained of blood. And die. He did not die at once. We stood in his narrow bedroom for the better part of an hour watching him die. Part of my change, as I said.”

Interview with The Vampire Part 1