believed someone was determined to commit the perfect murder, by feeding bits of a highly toxic metal, thallium, to his patient, brigida uto. for tense hours and days, the doctor and his team fought to save brigida's life. she consumed more than enough thallium to kill her. and yet, >> i do not know why i am here. but [laughs] i do not know why i am still alive, and that is scary. [laughs] >> meet brigida, she is still with us. >> did you feel like you were dying? >> i, i did. i did, but i was too afraid to admit it to myself. >> what kept you alive at that time? >> well, my son. wanting to see my son. >> as the antidote took effect, brigida, in essence, woke up. she found herself in a hospital bed with only wisps of hair on her head.