The father of the child on the life support must have gone through hell as the day of reality approaches. This is not a criminal offense. Try to think of it when our animals become diseased we give them shots to give them a peaceful death. It is similar except the child on the life support is partially dead.

 In some states euthanasia is still a crime. Even in 2007 California rejected the legalization of assisted suicide. Most states still consider a mercy killing a criminal homicide. I personally disagree, but that's not relevant to your question.