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The forensic psychologist added that when the urge to re-offend becomes stronger the person living a double life can become dangerous again. If the opportunity to re-offend presents itself, criminals might preplan illegal activity.

"There's a presumption that on the surface of a person who seems live a lifestyle of employment, of advanced education, that somehow that is incompatible with continued offending. And we don't know that to be the case," he said. 

"If, indeed, this is a person that is ultimately found criminally responsible … we don't know that there aren't other victims, which is why they are looking every place that he's ever been or visited to see if there are any other cases that fit similar patterns."

Serial offenders, he said, tend to "keep offending until they get caught," even if they have "cooling periods" in between offenses, either because they think authorities are on their trail or because they might simply be busy with "other relationships that are preoccupying them."

"But when push comes to shove … these urges, they don't go away," Mohandie said.

The suspect pleads not guilty

Mohandie emphasizes that Nilo is innocent until proven guilty in court. He is profiling any criminal suspect when he says that leading a double life is not uncommon.

"Mr. Nilo denies all the allegations, including the latest charges," his attorney, Joseph Cataldo, said. "You can expect both a legal and factual challenge to the government's case."

“I think they’re trying to solve some unresolved cases, and I’m afraid that the government might be piling on, just trying to claim that Mr. Nilo committed these crimes,” Cataldo said. And the district attorney’s office was “piling on.”

Earlier this year, at a corporate event, Nilo’s he used to make the match. Police did not get a warrant for the DNA. Cataldo questioned the constitutionality of how the DNA evidence was obtained and collected.