Kouri Richins allegedly had a boyfriend while married to Eric. She texted Josh Grossman about marriage. She had a secret $250,000 HELOC. Prosecutors say she searched for fentanyl.

Two lives. The wife Eric knew. And the woman planning his death.

This is Part 3 of The Perfect Wife — examining the premeditated mind.

Melanie McGuire lived this pattern to its extreme. On April 28, 2004, she signed mortgage papers with husband Bill for their first house. He called friends afterward, excited about the future.

That night, prosecutors say she sedated him, shot him, and dismembered him. Three Kenneth Cole suitcases. The Chesapeake Bay.

Two days later — while still disposing of his body — she filed a restraining order against him. Built her alibi while his remains were in her car.

Her Google searches convicted her: "Undetectable poisons." "How to commit murder." "Fatal insulin doses." Not panic. Research.

If you've ever discovered a partner was living a secret life — found the texts, the accounts, the evidence of someone who never existed — you know the vertigo of that discovery.

Bill McGuire signed papers for a house he'd never see. His wife was already planning his death.

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