Cheri Oliver died after a reported assault inside an Erlanger home in October 2024.
ERLANGER, Ky. — A family assault call on Ridgewood Drive became a murder case after 74-year-old Cheri Oliver died from head trauma, and her grandson has now admitted killing her in a plea that leaves a life sentence possible.
The case began with a 911 response and is now set for sentencing in Kenton County Circuit Court. Wyatt Testerman, 19, pleaded guilty but mentally ill on May 5 to murder in Oliver’s death. He was 18 when police arrested him outside the Erlanger home on Oct. 8, 2024. Prosecutors said the plea was not part of a deal that capped punishment, and the commonwealth’s attorney has said he will ask for life in prison.
Police said officers were sent to the 100 block of Ridgewood Drive near Narrows Drive around 2 p.m. for a reported assault. When they arrived, Testerman was outside and Oliver was inside. She had serious injuries to her head. Paramedics treated her before she was taken across the Ohio River to the University of Cincinnati Medical Center. She died at the hospital. Detective Tom Loos later told the court that Oliver had been found lying in blood and that the medical examiner found blunt trauma to the head as the cause of death.
Early police statements described the incident as a family dispute and said there was no broader danger to the public. That narrow public warning stood beside a far more serious set of allegations inside the case file. Investigators said Testerman admitted beating Oliver with his fists and a metal drinking tumbler. Witnesses said he became violent for no apparent reason. The alleged assault did not happen in a public place or during a burglary. It happened inside a family home, with relatives nearby, according to testimony and court accounts.
One witness was Testerman’s mother, who police said saw the attack and tried to intervene. Investigators said she struck him with a cane in an effort to stop the violence. Oliver’s ex-husband also was present at the home, according to testimony. At an earlier hearing, Loos said Testerman had told detectives that he had been watching a movie with his grandparents before the assault. The detective also said Oliver’s ex-husband reported that Testerman warned Oliver that she would face consequences if she left a chair.
The account that later emerged in court was even more severe than the first police summary. Prosecutors said Oliver was punched more than 40 times and stomped about 12 times. They also said Testerman used a metal drinking tumbler during the attack. The phone evidence became a major part of the case. Prosecutors said Testerman set up a device to record the killing before pushing Oliver to the floor and striking her. The recording, they said, captured the violence that jurors would have had to review if the case had gone to trial.
Testerman’s plea changed the courtroom path but not the gravity of the evidence. He pleaded guilty but mentally ill, a legal result that allows treatment in prison while preserving the criminal conviction. During the hearing, he acknowledged drug use and admitted the killing. “I had been abusing acid for quite some time,” he said. He also told the court that he attacked Oliver without reason and struck her until she died. The statement marked a sharp turn from the earlier plan to contest criminal responsibility at trial.
The defense had previously explored an insanity defense. That approach can require proof that a defendant’s mental state met a strict legal standard at the time of the crime. Testerman’s attorney later said a defense expert found Testerman had antisocial personality disorder and was likely experiencing a psychotic episode connected to voluntary drug use. Prosecutors have said Testerman’s psychosis history was tied to drugs. That distinction matters because voluntary drug use generally does not satisfy the legal test for insanity. Testerman told the judge he had hallucinations but understood the plea hearing.
For prosecutors, the next issue is punishment. Kenton County Commonwealth’s Attorney Rob Sanders has called the killing a vicious attack on an elderly, defenseless woman. He said prosecutors will ask Judge Patricia Summe for the maximum sentence. The sentencing range for murder in Kentucky includes 20 to 50 years or life in prison. Because there was no plea agreement with prosecutors, the judge will hear arguments before deciding the punishment. The guilty but mentally ill plea does not remove the possibility of a life sentence.
The case also leaves a record of how quickly a household conflict turned fatal. Police have not reported a clear motive. Witnesses described sudden violence. Testerman’s own courtroom statement said the attack happened without reason. Investigators said there were family members in or around the home, but neither their presence nor the mother’s intervention stopped the assault before Oliver suffered fatal injuries. The number of blows, the alleged use of the tumbler and the recorded evidence are expected to be central at sentencing.
Oliver’s death placed a quiet Erlanger neighborhood into a court record that now spans police response, medical findings, witness accounts, mental health review and a guilty plea. The first responding officers closed the scene and said the public was not at risk. The courts then took up the longer question of accountability. Testerman’s age, drug use and mental health history may be raised in mitigation. Prosecutors are expected to argue that the facts of the killing outweigh those issues.
Testerman is due back in court July 7 for sentencing before Judge Patricia Summe. Until then, the conviction stands on his guilty but mentally ill plea, while the sentence remains open between a term of years and life in prison.
Author note: Last updated May 25, 2026.