How could he kill himself? He was eighteen years old...
Was he stressed because of exams? Did he compare himself to his competitive classmates and felt their supremacy?
Was he lonely? Did he break up with his girlfriend? Was he suffering from low self-esteem?
Was he from a low-income family? Did he struggle financially and did not have anyone to help him out?
Did he have psychological issues? Did he struggle because of some childhood trauma?
I would ask all of these questions if I would know him and his inner battle. Too late...
How often we do not notice other people's pain and struggle. It is much easier to pretend that success and achievements are the only things that matter in life. And then it is late. And then we say: "Poor kid, how could he?"