While the variety of responses of psychotherapy groups to new members is wide, this article addresses those that are treatment destructive, that is, murderous in that they are aimed at the elimination of a new sibling. A number of frequently encountered destructive response patterns to new members are illustrated and categorized. It is suggested that survival of the new member is best insured by adequate preparation of the group so that the nucleus of powerful feelings activated in this situation can be felt and expressed prior to the addition of the new member. A clinical example of appropriate preparation is offered, and the contributions of group therapists to new member casualties are noted.