someone left this comment on my blog " im gonna write a nice suicide note with this site on it saying that this site broke my heart into oblivion and there’s no hope to life for. and it’s to be carried out. tomorrow morning. so watch for a post from my parents and be on the look out for the police. shithead" erm, I'm not sure if this guys for real or what.. If he did commit suicide could their be implications for me?
obviously dont know the content of your site but assuming it isnt a pro-suicide/ pro anorexia (etc) or a sustained attack on the person in question then almost certainly not.
If you're really asking,"Will someone sue you for that person having killed him/ herself because of your site?", you really won't know until someone brings it to your attention. But...it's their burden to demonstrate that. OTOH, that person could've probably changed his or her mind if s/he just did not visit your site and did something more happily productive. Quite amazing that some people forget they always have a choice.