The goal of this study is to test an enhanced outreach intervention (EOI) delivered by Samaritans of Boston (a community organization that provides support during mental health crises) for people after they leave an emergency department (ED) visit for suicidal thoughts. The main questions it aims to answer are:

• Does the EOI reduce suicide-related behaviors?
• Does the EOI increase outpatient treatment attendance?
• Is the EOI acceptable and feasible?
• Can the EOI be delivered with fidelity by Samaritans?

Participants will be randomized to the EOI plus care as usual or care as usual alone. Participants in the EOI plus care as usual group will:

• Receive outreach (by call or text) at a planned time once per week for the next 12 weeks. During these conversations, Samaritans staff will ask participants questions about their suicidal thoughts and behaviors, develop and review a list of coping skills to use if they have suicidal thoughts, and discuss plans for receiving mental health care.
• Receive caring messages from Samaritans staff at least once per week.
• Receive standard care that hospitals give for patients who present with suicidal thoughts.
• Be asked to complete monthly self-report questionnaires.

For care as usual alone, participants will:

• Receive standard care that hospitals give for patients who present with suicidal thoughts.
• Be asked to complete monthly self-report questionnaires.

The period after discharge from an emergency department (ED) is a critical time of increased risk for suicide and related behavior (SRB). Brief "caring contact" interventions that provide follow-up and support after a healthcare visit have been shown to reduce SRB and are now recommended best practices for suicide prevention in healthcare systems. However, system- and individual-level barriers to widespread implementation exist. For example, deployment of brief contact interventions requires dedicated resources and staffing within already overburdened healthcare settings, and even single-session interventions require robust provider training and ongoing oversight for successful implementation.

The purpose of this study is to evaluate a recently developed Enhanced Outreach Intervention (EOI) for post-ED discharge that combines multiple evidence-based suicide prevention components (e.g., safety planning, risk assessment, caring contacts, and care engagement) and is delivered through a partnership between a healthcare system (Mass General Brigham [MGB]) and a local crisis line organization (Samaritans of Boston). Combining multiple evidence-based interventions has the potential to increase effectiveness over usual practices, and partnering with a community organization vastly increases scalability.

Samaritans staff will undergo robust, multifaceted training on the EOI, and use standardized decision trees to guide EOI delivery. The investigators will conduct a randomized controlled trial (N=300) of the EOI plus care as usual versus care as usual alone after ED discharge to test effectiveness of the EOI and collect data on implementation-related factors. The investigators will also explore potential moderators of intervention effects, including age, sex, race/ethnicity, and predicted risk of suicide attempt at baseline.

Inclusion Criteria:

1. Currently a patient being treated and evaluated by psychiatry service in an MGB ED
2. Participants enrolled in another study (NCT05671133; PI Nock) conducted by the research team who fall into the top 50% of risk based on the suicide risk prediction algorithm used in that study
3. Able to read English
4. Ownership of a smartphone (iOS or Android) and consistent access to their smartphone following discharge from the current treatment unit or program; ability to be reliably contacted
5. Willing to provide contact information for collateral contact
6. Willing to share contact information and key clinical information with Samaritans of Boston
7. Consent to unencrypted text or email communications
8. Willing to provide social security number (SSN) or individual taxpayer identification number (ITIN) for study compensation

Exclusion Criteria:

1. Any factor that impairs an individual's ability to comprehend and effectively participate in informed consent, including the presence of gross cognitive impairment due to florid psychosis, intellectual disability, dementia, or acute intoxication
2. Presence of extremely agitated or violent behavior at the time of consent or enrollment