Here are Nadia Kajouji and Mark Drybrough, who took their lives in 2005 and 2008, respectively. They were preyed upon by a man claiming to be a young nurse on an internet forum that was meant to help individuals in need.
This is the very sick and twisted man who took pleasure in convincing others to commit suicide by hanging, William Francis Melchert-Dinkel. He claimed to be a twenty-something nurse in Minnesota, and he may have convinced up to 50 vulnerable people to commit suicide.
Journalist Nadyia Labi at GQ, in 2011, did great in-depth coverage of this entire sordid story, read it here.