The purpose of this article is to present the relational space of the psychiatric nurse, in a context of French language mental health services delivery in Ottawa, during the period of psychiatric deinstitutionalization. The case study of a Francophone patient with 26 years of follow-up care at the Montfort Outpatient Mental Health Clinic was selected as a sample. Over this psychiatric life-course, 63% of her encounters were with a nurse, 27% with psychiatrists, 5% with occupational therapists, 4% with social workers and 1% with psychologists. Among the different tasks documented by the nurses, six different types of intervention emerge. The case study, therefore, reveals that the nurse occupies a more significant relational space than that of the other professionals of the multidisciplinary team.