Alleviating Suicidality by Combining Psychotherapy and IM Ketamine for Rapid Treatment in the Emergency Department

Inclusion Criteria: * Adult men and women between the ages of 18 and 70 presenting to the Emergency Department with acute suicidal ideation anticipated to be admitted as an inpatient at University Health (UH) or Carl R Darnall Army Medical Center (CRDAMC) based on the ED and admitting providers determination that the patient warrants hospitalization for suicidality and the capacity of the institution to admit the patient. * Able to read and write English. Exclusion Criteria: * Serious mental illness with active and significant signs of psychosis, mania, hallucinations, paranoia, agitation, and drug-induced or other toxidromic symptoms determined to be the priority of treatment relative to treatment of the suicidal thoughts and behaviors. * Acute intoxication with clinically significant symptoms as determined by the ED provider to significantly increase the risk of participation (e.g., potential interaction with ketamine) or render the patient unable to consent. * The patient is not capable of understanding the research procedures and providing informed consent for themselves as determined by the research staff obtaining informed consent in consultation with the patient's ED provider. * Admittance to and treatment in an ED for acute suicidality within the past 30 days as determined by self-report, or if available, hospital records. * Lack of reliable means to be available for follow-up assessments (e. g, working mobile phone) as determined by self-report. * Persistent resting blood pressure lower than 90/60 or higher than 180/110, or persistent resting heart rate lower than 45 beats/minute or higher than 120 beats/minute. * Injuries requiring procedural sedation with ketamine as determined by the patient's ED provider. * Pregnancy as determined by pregnancy testing, or self-report of breast feeding. * Known hypersensitivity to ketamine as determined by self-report. * Legal or illegal use of ketamine in the previous 90 days as determined by self-report. * End-stage or severe cardiovascular (e.g., acute coronary syndrome (ACS) or decompensated heart failure), end-stage or severe liver, or kidney disease as determined by the ED chart history and ED provider's exam. * Patient is a prisoner as determined by prisoner escort. * Patient is physically restrained or actively under custody of law enforcement.