My father committed suicide in 1997 and I have attempted it twice for reasons I will not go into here. Looking back I ask myself,"What were you thinking"? Almost everyone in my family has a chemical imbalance that causes this depression. I would advise anyone to seek help for themselves or their loved ones if suffering from depression. If someone you know suffers from depression, first reassure tham that it's not their fault, then suggest to them that they may have a chemical imbalance. If they won't seek help for themselves then you take matters into your own hands and call the suicide hotline, ask them what you can do for your loved one.
Buttercup, you nailed it on the head, great post I could've have said it better myself.