Horrific: Child porn culprit kills woman, rapes 10-year-old (PICTURED)

David Renz hides his face in shame while state police escort him on Friday.

An upstate sicko cut off his electronic monitoring bracelet before carrying out a savage crime — stabbing a school librarian to death and raping a 10-year-old girl, cops said.

Investigators were probing Saturday how 29-year-old David Renz, who was previously charged with possessing child pornography, managed to disable his monitoring device.

Renz, a computer whiz, has already faced jailhouse justice in the wake of his sickening crime — suffering a broken nose in a prison fight.

He was beaten inside a holding cell at the Onondaga County Justice Center on Friday — a day after the attack.

Cops say Renz abducted 47-year-old Lori Bresnahan and the girl as they left a gymnastics class at a mall outside Syracuse late Thursday.

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An undated photo of Renz, who was in jail for possession of child pornography before carrying out his savage crime.

Renz followed the child out of the CNY Gym Centre about 9 p.m., authorities said.

He tied up Bresnahan and then raped the girl inside the Northern Mall parking lot in the town of Clay.

Then, he drove the woman’s car to a wooded area with both victims tied up inside.

The girl managed to escape while Renz was repeatedly stabbing Bresnahan, authorities said.

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via Facebook

Renz abducted 47-year-old Lori Bresnahan (pictured) and a 10-year-old girl as they left a gymnastics class at a mall outside Syracuse. Renz then raped the girl and killed Bresnahan.

The girl was later found by a passing motorist. It was unclear how she escaped.

“We’re still trying to piece the timeline together,” New York State Trooper Jack Keller said.

Renz was captured near the wooded area after the driver who found the girl told a 911 dispatcher he saw a man running from the scene.

Hours before pouncing on his victims, Renz methodically deactivated and removed his electronic ankle bracelet, authorities said.

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Dick Blume/ASSOCIATED PRESS

State police investigate the car connected with the carjacking on Verplank Road in Clay, N.Y.

He had been outfitted with the device in January when federal authorities released him from custody on child pornography charges.

The ankle bracelet is supposed to immediately alert probation officers if it has been tampered with, but the technically savvy Renz beat the system.

It wasn’t until 11:30 p.m. that officials at the company responsible for the device noticed that there had been no movement from the bracelet for hours and notified the U.S. Probation Office, according to the Syracuse Post-Standard.

By that time, the librarian was dead, the girl had been raped and Renz was already in police custody.

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Image courtesy Liverpool School District website

Renz tied up the victims before he stabbed Lori Bresnahan. The girl escaped and was found by a passing motorist.

Reps for the Colorado-based firm BI, which works closely with correction officials, could not be reached Saturday.

Renz — who graduated from SUNY Oswego in 2011 with honors in computer science — was arraigned Friday on murder, rape and kidnapping charges and ordered held without bail.

When he showed up at federal court hours later for a probation violation, his face was swollen and tissues were stuffed up his nose.

His lawyers said he was assaulted by other inmates.

Renz was moved into his own cell Saturday, officials said.

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