Using data from all waves of the National Longitudinal Survey of Adolescent Health, the short-term & long-term impact of an adolescent friend’s suicide on an adolescent’s depression & suicidality were investigated. Results suggest that a friend’s suicide is associated with heightened suicide thoughts & attempts & greater depression during the first year after loss. Six years later, analyses show concurrent behaviours most relevant to explain suicidality fluctuations. Findings suggest the importance of therapeutic availability, especially during the first year, for those losing a friend to suicide. (29 refs.)