The purpose of this randomized controlled trial (RCT) is to determine if five 60-minute sessions of Written Exposure Therapy for Suicide (WET-S) reduces the presence, frequency, and severity of suicidal ideation, suicide plans, suicide gestures, suicide attempts, non-suicidal self-injurious behaviors, and re-hospitalization for suicidality and if WET-S reduces posttraumatic stress (PTS) symptom severity