>> then investigators got a telephone call from sandy's sister. she told them about a conversation she had with sandy a year before her death. >> sandra had indicated to her sister, if anything ever happens to me, i've left a note for you in the china cabinet at the home. please just get it and read it. >> with a warrant, investigators searched the duysts' home. >> this china cabinet not only held china, but it seemed to be like a repository, if you will, for family paperwork. so, i just began searching this china cabinet from top to bottom. on the very bottom shelf, way in the back behind some dishes, there was a white envelope, and all it said on it was the name of sandra's sister. and i immediately retrieved it from where it was. it was sealed. i didn't open it up at that point. >> the note was immediately sent to the crime lab, where it was opened by forensic analysts. it proved to be nothing less