. >> as an exit guide, langser says he's very careful not to give specific suicide instructions. >> then they may have some questions about it. but we don't touch any materials or any equipment. so they're on their own. >> for jana, here's what the last few days of her life look like. march 27th, 2007, she wrote a check out to party city for $64.84. she noted helium balloon kits. a few days later, she bought other supplies. i don't want to get too specific. >> ever get used to seeing it? you saw it 100 times. >> the day i get used to it, i will stop. >> when breathed in, helium depletes the body of oxygen. doctor egbert showed me how it all works. we've chosen not to show the details, but to see it firsthand, even as a demonstration, was disturbing. >> was this horrifying to you? it was horrifying to me to hear about it. i can't imagine being there. >> you're not talking to a guy suffering with pain and smiling and saying thank you, thank you, docto doctor. >> langsner and one other guide were with jana on her final night, april 12th, 2007. >> she had her new pajamas on and once again, w