Final answer:
The therapist should report the client to the authorities and encourage them to turn themselves in. If the client refuses or it is not safe to continue working with them, the therapist may need to terminate the therapeutic relationship.
Step-by-step explanation:
When a client discloses that they have murdered someone in the past and it was not a minor, the therapist must take certain actions. The therapist’s primary duty is to protect the client from personal harm, so their safety is of utmost importance. They should also consider the safety of others and have a responsibility to report any potential danger to the authorities. In this situation, the therapist should report the client to the authorities to ensure that proper measures are taken to address any potential threat to society. However, the therapist should also encourage the client to turn themselves in to take responsibility for their actions. It may be necessary to terminate the therapeutic relationship if the client refuses to take appropriate actions or if the therapist believes it is not safe to continue working with the client.