Talks about suicide or death. Children or adolescents are more likely than adults to do this. A failed suicide attempt. Most people have heard that a suicide attempt is a call for help. Many people who do kill themselves have previously made other attempts.
Depression can lead to impulsivity and risk-taking.
Drug or alcohol abuse. Not only does depression increase the risk of alcohol or substance abuse, but alcohol is implicated in over half of all suicides. In adults, this may take the form of straightening out their files, catching up on paperwork, updating their will, etc. Giving away treasured objects. Someone planning suicide may give away favorite possessions to their friends or loved ones.