anne's desk. and when they ran down the "freak of ark" e-mail account? the ip address was the stoutsody's mind that this email was actually barbara miller. >> and then it turns out to come from anne's basement. >> correct. >> reporter: and the letters and cards starting soon after bill confessed to his intemperate weekend? the bill and barbara barbeque invitation? they were all postmarked "fort smith, arkansas." clever. how did she do it? detectives talked to the fort smith postmaster who'd received occasional envelopes full of letters addressed to montana which were dutifully stamped "fort smith" and put into the outgoing mail. detectives discovered the subterfuge in anne's car. unsent copies of those same cards and letters. >> anne's fingerprints were on the outside of the envelope which would not be unusual. but when they opened it, not only did her dna seal the envelope, but the only things found on the letter inside were latent prints from anne stout. >> so many mistakes. >> so many mistakes. >> reporter: mistakes, yes. but also more. a level of fiendishness. >> it sort of smell