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"Maybe purchasing that property created the electronic footprint opportunity for the FBI to exploit, which therefore led to his capture," he said.

Gianluca Li Causi, data processing manager for SHARK-VIS at the Italian National Institute for Astrophysics, explained how it works: "We process our data on the computer to remove any trace of the sensor's electronic footprint. We then select the best frames and combine them using a highly efficient software package called Kraken, developed by our colleagues Douglas Hope and Stuart Jefferies from Georgia State University. Kraken allows us to remove atmospheric effects, revealing Io in incredible sharpness."

But LaBarbera, who retired from the department in 2015, said motives can be hard to determine when a suspect is dead and hasn’t left a paper trail or electronic footprint detailing their thoughts.

Her phone had not pinged cell towers since early on Jan. 1, and investigators could find no electronic footprint.

Mr. Walshe has said his wife was called away for a work emergency that day and had to catch a flight to D.C, but police said there’s no electronic footprint of Ms. Walshe hailing a rideshare service or purchasing a plane ticket for Jan. 1.