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Fulfill this rape fantasy. >> reporter: everything pointed to her husband's ex. >> they said "we're gonna have to take you into custody." >> reporter: you're incarcerated. >> potentially for the rest of my life. >> reporter: but hiding behind the threats was a cyber-secret. >> evil. it's something the devil might do. >> reporter: so who was the real devil? >> the da in this case would use the word, diabolical. >> i think he's close to the mark. hello. welcome to "dateline." michelle hadley seemed to have it all. a loving family, solid education, with the opportunities and support to help her f...

Prosecutors were still doing everything they could to link those emails to michelle. >> we have a verskille detective that was working on the case and he was in constant communications with the district attorney's office and trying to piece it together, to help prove a case and solidify it for court. >> reporter: problem was -- >> it just -- it wasn't coming together. these electronic messages were coming from -- from a different place. and we couldn't verify that it was coming from michelle hadley's device. >> reporter: it was a blow to the prosecution's case, but there was more evidence than...

>> reporter: june, 2016. michelle hadley was out on bail living with her parents. anaheim police suspected michelle had sent threatening emails to her ex-boyfriend, ian, and his pregnant wife, angela. even though on its face it didn't make much sense. >> reporter: a young woman who lived an exemplary life, good student, she's trying to get an mba, and -- >> well, there's two sides to every person, and all we're seeing is the evidence that looks very clear that everything is -- is originating from michelle hadley. >> reporter: but the case against michelle went way beyond threatening emails. po...

>> faking a cancer episode. >> yes, faking cancer. >> and she was not pregnant with ian's child. it was the trail of e-mails that ultimately cracked the case. it turned out the e-mails sent from the condo didn't come from a computer at all. but the d.a. says from a cell phone, angela's cell phone. in an already beyond stran case, turd things up to 11. >> their original victim ended up being their number one suspect. >> how is that for whiplash? >> i don't think anyone could believe it. >> it was time. six months after michelle hadley was first charged, angela diaz was arrested and jailed. >> g...

Discuss them on camera. she later told us, "it was a symptom of post traumatic stress disorder," which she blamed on her volatile relationship with her ex. but, she told us, she never sent any emails to angela. in fact, michelle says she didn't even know her. >> i've never heard of her, i've never communicated with her. >> reporter: couldn't say where she lived or pick her out of a lineup. >> exactly. i mean, i'm assuming she lives in the condo with him. but aside from that, that's the extent of what i know about her. i don't know what her job is. i don't know where she works. i know nothing a...