The cellphone evidence in Melissa Barthelemy's case maps Rex Heuermann's alleged movements with precision. Prosecutors say the burner phone she'd connected with traveled from Massapequa Park to Midtown Manhattan on the day she disappeared — mirroring Heuermann's daily commute. Hours later, Melissa's own phone traveled the reverse route — from Manhattan back toward Long Island. And then, for five weeks, someone used Melissa's phone to call her 15-year-old sister, taunting her with details of the killing. Under three minutes per call. From crowded Manhattan locations. Emotionally flat. Calculated.

Episode 5 of "The Seven." Melissa was 24, from Buffalo, living in the Bronx, working escort ads on Craigslist because the cosmetology career she'd trained for hadn't taken off yet. She was four feet ten, 95 pounds. She had eight cats. Her landlady described her as a sweet girl. Her remains were the first found in December 2010 — discovered by a cadaver dog during a training exercise along Ocean Parkway.

Prosecutors allege Heuermann's internet searches included more than 200 queries about the Gilgo investigation and images of the victims' families. The phone trail, the taunting calls, the DNA, the search history, and Melissa's full story — all covered here.

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