Nobody killed Jesus. The Jews wanted him dead. The Romans hung him on a cross. But it was Jesus himself who gave up his spirit. He was the only one able to give up his own life (literally) and take it back of his own power. Besides, considering what dying did for everyone, by accusing the Jews or whomever of doing it you should be THANKING them.
Nobody killed Jesus -- He gave up His life willingly on behalf of us. The fact that human tools were used is irrelevant.