FAIRFAX, Ohio — A 13-year-old boy spent months researching “how to find the perfect victim,” “how to strangle someone,” and how to beat a police interrogation, then slipped into his 64-year-old neighbor’s home in the dead of night and carried out the attack he had plotted.
Sheila “Denise” Tenpenny was alone in her Germania Street house in the early hours of Feb. 2, 2025, when the teen entered, struck her as she lay in bed, and strangled her until she died. The victim fought for her life: she scratched the boy’s face, tore out a chunk of his hair, and left his blood and DNA scattered across the scene. His watch was later found under her body. Her brother discovered her with a pillow over her head and called 911 in horror.
Prosecutors said the boy had been planning the killing for months. He used ChatGPT and ordinary internet searches to study victim selection, the physical act of strangulation, and interrogation-evasion tactics. After the murder he logged on and posted the chilling message: “This one was a fighter.” He also wrote, “I think I just got caught.” Investigators later found a journal in his possession with the words “I will kill you” and a copy of “Confessions of a Serial Killer.”
The case took a bizarre turn because the killer has an identical twin brother. Standard DNA testing matched both boys, leaving lab technicians unable to distinguish between them. Police placed the twins together in the back of a cruiser. Bodycam audio captured their confusion: one said, “I don’t know what’s going on.” The other replied, “Neither do I,” and speculated it might be “an intimidation tactic.” When detectives later showed the innocent twin a photo of the watch recovered from under Tenpenny’s body, he instantly recognized it as his brother’s and put his head in his hands. “There’s no way. There has to be someone who planted evidence,” he said.
When officers first arrived at the family home, one twin had visible scratches on his face. Their mother blamed the family cat. Five days after the killing, the parents jointly asked a court to let both boys move with their mother to California. The killer was arrested days later.
In November 2025, the now-14-year-old pleaded guilty to aggravated murder, aggravated burglary, and strangulation. Under the juvenile plea deal, he will remain in Ohio Department of Youth Services custody only until his 21st birthday, the maximum age the system can hold him. He is also required to complete a victim-awareness class, earn his high-school diploma, and undergo cognitive behavioral therapy. An Ohio Bureau of Criminal Investigation agent called the case unprecedented in his 20 years of investigating violent crimes and described the premeditation as “chilling.” He noted the boy left DNA behind and botched a cleanup attempt, then warned that the real question is whether the teen will learn from those mistakes once he is free.
Tenpenny’s family has described her as a kind-hearted woman with a sharp sense of humor whose light touched everyone who knew her. Neighbors and relatives have expressed outrage that a premeditated, researched killing of a sleeping woman in her own bed will result in the perpetrator walking free while still a young adult. Investigators continue to examine the boy’s online communications with others who may have discussed the crime with him.
The twin who did nothing wrong now lives with the knowledge that his identical DNA placed him at the center of a murder investigation, while the actual killer is on a clock that ends at age 21. Whether he emerges a changed person, or simply more careful next time, remains the open and unsettling question.
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