Nicole Elizabeth Virzi, 32, entered the guilty plea Wednesday, October 28, in an Allegheny County courtroom in Pittsburgh, Pennsylvania, bringing an end to a criminal prosecution that had exposed the disturbing circumstances surrounding the June 2024 death of infant Leon Katz. Virzi, who was pursuing a doctorate through the San Diego State University/UC San Diego Joint Doctoral Program in Clinical Psychology at the time of her arrest, had previously faced the possibility of the death penalty.
The plea agreement included third-degree murder and additional charges stemming from injuries to Leon and his surviving twin brother, Ari. Allegheny County Common Pleas Judge Jill E. Rangos imposed the lengthy prison sentence after prosecutors consulted with the children's parents, Savannah Roberts and Ethan Katz, who had considered Virzi one of their closest friends.
Virzi was visiting the couple in Pittsburgh in June 2024 when she offered to help care for their newborn twins. What the parents believed was a visit from a trusted friend instead became an unimaginable tragedy after investigators determined that Virzi had deliberately injured both infants.
On June 15, Virzi reported noticing injuries to Ari, including swelling and scratches around his genital area. Concerned for their son's well-being, Roberts and Katz took Ari to a hospital, leaving his brother Leon in Virzi's care.
Later that evening, Virzi called 911 and claimed Leon had fallen from a baby bouncer while she was briefly out of the room. The infant was rushed to UPMC Children's Hospital of Pittsburgh, where doctors discovered catastrophic head injuries, including a skull fracture and multiple brain hemorrhages.
Leon died the following day, June 16, 2024, which was Father's Day and his parents' first wedding anniversary. The Allegheny County Medical Examiner's Office determined that his death resulted from blunt-force trauma to the head and ruled it a homicide.
Investigators concluded that Leon's injuries could not have resulted from the relatively short fall Virzi described. They also determined that Ari's injuries had been deliberately inflicted, meaning the emergency that prompted his parents to leave Leon in Virzi's care had itself been caused by the woman they trusted to watch their children.
During an extensive police interrogation, Virzi initially denied harming Leon before making incriminating statements about her actions. Prosecutors said she admitted shaking and dropping the infant and described experiencing violent urges toward children dating back to her own childhood.
According to prosecutors, Virzi told investigators she had "always had a compulsion she could not control to harm kids." Her statements became a central element of the criminal case, although her defense attorneys previously argued that the admissions were involuntary because of the lengthy and allegedly coercive interrogation.
Judge Rangos rejected the defense's attempt to suppress those statements in February 2026, clearing the way for prosecutors to introduce them at trial. Virzi had maintained her innocence before accepting the plea agreement, which eliminated the possibility of a capital trial and resulted in her conviction for third-degree murder and related offenses.
The case attracted significant attention in San Diego because of Virzi's academic background. At the time of the killing, she was an advanced doctoral student in the SDSU/UC San Diego Joint Doctoral Program in Clinical Psychology, a specialized program that trains researchers and clinicians in psychological science and behavioral medicine.
Her published research examined subjects including depression, chronic stress, cardiovascular health and the relationship between physical activity and pain. Academic publications identified her affiliation with the joint doctoral program, and her research involved collaborators associated with UC San Diego and the VA San Diego Healthcare System.
The contrast between Virzi's education in human behavior and the crimes she admitted committing is particularly unsettling, although there is no evidence that her academic work contributed to her actions or that the universities were aware of the impulses she later described to investigators.
The emotional consequences of the crimes were laid bare in a victim-impact statement submitted by Leon's mother, Savannah Roberts, who described how the betrayal destroyed her sense of security and fundamentally changed her ability to trust other people.
"Nicole's actions have fundamentally changed me as a person and I feel unrecognizable from the Savannah I used to be," Roberts wrote to Judge Rangos, according to NBC News. She said she could never have imagined that someone she considered her best friend was capable of such cruelty.
Roberts also described the overwhelming guilt she continues to experience over having entrusted her babies to Virzi, despite having no reason to suspect that her longtime friend intended to hurt them. She said the experience shattered her confidence as a mother and left her struggling to feel safe even in her own home.
The mother revealed that for nearly a year after Leon's death, she could not shower, brush her teeth or use the bathroom without having her husband nearby. She needed reassurance that Ari was safe and often asked Ethan to remain outside the bathroom holding their surviving son where she could see him.
"I've still never been able to leave Ari alone with a friend and I don't know if I ever will," Roberts wrote.
The family's grief carries another heartbreaking dimension: both Roberts and Katz are twins themselves, and they had always dreamed of becoming parents to twins. Their sons were born into a family that understood the unique bond between siblings who share the same birthday, only for that relationship to be destroyed six weeks later.
In her statement, Roberts described the difficulty of watching Ari grow and reach milestones that Leon will never experience. Every birthday and childhood achievement is accompanied by the absence of the brother who should have been beside him.
The Allegheny County District Attorney's Office said prosecutors had been prepared to take the case to trial but agreed to the plea after extensive discussions with the family and consideration of public safety.
"This was a horrific case in which Virzi used her trusted relationship with the Roberts/Katz family to place herself in a situation where she could commit her horrendous acts," prosecutors said in a statement reported by NBC News.
The sentence requires Virzi to serve a lengthy minimum prison term before she can become eligible for parole. Although the agreement spared her a potential death sentence, it also means she could remain incarcerated for the rest of her life.
The guilty plea brings legal resolution to a case that had remained contested for more than two years, but it offers little relief from the lasting consequences for Leon's family. Their surviving son will grow up without his twin brother, and his parents must continue rebuilding their lives after learning that the person responsible for their child's death was someone they had welcomed into their home and trusted with their children.
For San Diego, the case represents a deeply disturbing chapter involving a former member of the region's academic community whose promising professional trajectory ended in a murder conviction. For Leon Katz's family, the significance is far more personal: a six-week-old child was killed by a trusted friend, and no prison sentence can restore the life that was taken.
