Victims are driven by pain not choice, but they are often in relationships governed by ethical duties. Here are some thoughts on ethics and suicide. Choice implies that a suicidal person can reasonably look at alternatives and select among them. If they could rationally choose, it would not be suicide. These people are usually available, they have considerable knowledge of the suicidal person's past history, and it doesn't cost anything to talk to them.
Intervention is supposed to help the patient.
At regular intervals ask the patient if the treatment is helping. Stay abreast of developments in the field. Some Ethics Codes American Psychological Assn. National Assn. of Social Workers American Counseling Assn. The very first words of a psychologist to a call from the survivors of a suicide victim.