Calling him a parent's, and every civilized person's, "worst nightmare," a federal judge sent David Blaszcak to prison for 21 years and 10 months. 

It was the maximum sentence Blasczak, 70, of Newark, could receive for pleading guilty to three counts of possessing child porn.

A former pediatrician and general practitioner, Blasczak admitted to Homeland Security he owned 2,557 child porn files and 78 videos, all purchased online. The U.S. Attorney's Office could not secure restitution for the families of four girls seen in that collection.

He originally denied abusing any of his child patients in an interview with federal agents, which was brought on by an investigation into an online child pornography dealer.

The child porn conviction became how authorities finally captured a predator who twice before had been investigated and who the judge called "a monster." 

After being investigated for sexual abuse in the 1990s, Blasczak admitted he had fondled his daughter’s childhood friends during sleepovers his family hosted years ago, sometimes undressing them as they slept. 

"He used a position of esteem in a small town to lure, gain access to, and exploit children, and he victimized so many children by doing it," prosecutor Kyle Rossi said. 

Blasczak also came clean on a scheme he created while at Clyde Family Health Center: He’d talk mothers into allowing him to photograph their young daughters' genitals for a phony study on child abuse.

"This is clearly an unthinkable case. But it's not an isolated case," said Douglas Gregory of the U.S. Attorney’s Office. "We continue to prosecute individuals who would continue to prey upon young children." 

More than 30 people came forward to assist in the investigations.

Victims who appeared for Blascak's sentencing cried as the judge told the court the former doctor admitted to sexually abusing his daughter, but blamed her suicide on a failed test and not his attacks.

Judge Charles Siragusa said Blascak's arrogance and his lack of remorse for his destructive conduct did not deserve leniency.

"The judge certainly expressed his disdain for a man's forty years of exploiting people in a small town where people looked up to him and trusted him," Rossi said.

During sentencing, Siragusa also said Blasczak first learned of his proclivity for pedophilia on his honeymoon and claims to have written novels about sexual abuse.