This topic came up just a couple hours ago, as a friend's aunt with cancer decided that blowing her brains all over the garage was preferable to sitting down with her loved ones and telling them that she loved them before OD'ing in a nice, peaceful setting. Her son which found her had to go "downtown" and be grilled immediately as a potential suspect after his Mom popped the top.
Suicide is a personal choice. Phucking up the lives of your loved ones by doing it in a grotesque fashion is just plain rude.
There are no competent child therapists. Kids have no bond with strangers. Real help will come from close family, and it has to be a concerted effort.