Despite stereotypes to the contrary, the recidivism rate among sexual predators is among the lowest, according to Levin.
"It is conceivable that Hernandez never again molested a youngster," he said. "This is particularly likely in light of his confession."
Feelings of remorse and empathy -- not typical in a sociopath -- might have kept Hernandez from repeating his behavior as he matured, he said.
The cold case was reopened in 2010 and, in April, investigators excavated a basement apartment steps away from Patz's home and the bodega where Hernandez said he killed the boy.
The new focus on the case led one of Hernandez's family members or a friend to alert police that they suspected Hernandez's involvement.
His neighbors in Maple Shade, N.J., said he led a quiet life and belonged to a Pentacostal Church, according to The New York Times.
Though Hernandez doesn't seem to fit the typical profile of a child killer, pegging a suspect into a psychological box can be misleading, according to according to Ken Lanning, a former special agent in the Behavioral Science Unit at the National Center for the Analysis of Violent Crime.
"It's complex, and no two cases are alike," said Lanning, who said he, too, doesn't know all the facts in the case. "But
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