NEW YORK CITY (WABC) -- Eyewitness News got an exclusive behind-the-scenes look at the technology the NYPD used to track down an alleged Queens couple's killer during a manhunt.

"That's him leaving the movie theater after using the victims' credit cards,"

It takes a lot to rattle a cop like Joe Kenny, but from the moment detectives collected neighborhood security video that allegedly showed Jamel McGriff pushing his way into an elderly couple's home, this was a case that would keep him up at night.

"What was most troubling about it was that we were hearing initially that he was knocking on doors trying to gain entry into people's homes," NYPD Chief of Detectives Joseph Kenny said.

McGriff allegedly set fire to the Bellerose home that he gained entry to earlier this month after tortur

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