Did you know that twice as many people die by suicide each year than by homicide? Were you aware that suicide is the second leading cause of death for people 15-34? This page from the National Institute of Mental Health provides basic information about how to recognize and help someone who might be in crisis:
It also provides phone numbers to call if you yourself are in crisis. September 7-13 is National Suicide Prevention Week, so if you or someone you know needs help, there's no better time to ask.