Too many people I have known well have commit suicide. One was my estranged adopted daughter. She died by her own hand many years after she left us. A close friend and a neighbor also chose to die. It’s horrible to lose people this way. And even if you see warning signs in an adult friend, there is not much you can do to stop it if the person is determined. Even if that person knows you care a lot about him and would do anything possible to help alleviate his pain.