In Kentucky, Wyatt Testerman pleaded guilty but mentally ill before a trial over Cheri Oliver’s death.
ERLANGER, Ky. — Prosecutors said a cellphone recording became central evidence in the murder case against Wyatt Testerman before the 19-year-old admitted killing his grandmother inside an Erlanger home.
Testerman pleaded guilty but mentally ill on May 5 to murder in the death of 74-year-old Cheri Oliver. The plea came without a sentencing agreement, leaving him exposed to 20 to 50 years or life in prison. Kenton County Commonwealth’s Attorney Rob Sanders said prosecutors will seek life. Sentencing is scheduled for July 7 before Judge Patricia Summe, and the alleged recording is expected to remain a key part of the state’s argument for the maximum penalty.
The recording, as described by prosecutors, gave the case a stark evidentiary center. They said Testerman placed a phone into position before pushing Oliver to the floor and attacking her. Court filings and testimony described more than 40 punches, about a dozen stomps and blows with a metal drinking tumbler. Prosecutors said the video captured the killing in a way that would have required jurors to watch violence inside a family home. Sanders said the content was exceptionally disturbing and helped shape the state’s decision to press for life in prison.
The attack occurred Oct. 8, 2024, in the 100 block of Ridgewood Drive near Narrows Drive. Erlanger police were called around 2 p.m. for a reported assault. Officers arrived to find Testerman outside the residence. Oliver was inside with severe trauma to her head. Paramedics treated her at the scene and transported her to the University of Cincinnati Medical Center, where she later died. Detective Tom Loos testified at an earlier hearing that Oliver was found lying in blood and that an autopsy listed blunt trauma to the head as her cause of death.
Witness accounts added another layer to the video evidence. Investigators said Testerman’s mother and Oliver’s ex-husband were present. Police said the mother tried to stop the attack by striking Testerman with a cane. At an earlier hearing, Loos said Testerman told detectives he had been watching a movie with his grandparents before the assault. Loos also said Oliver’s ex-husband reported that Testerman had warned Oliver she would face consequences if she got out of a chair. Authorities have not identified a clear motive.
The first police framing of the case was brief and public safety focused. Officials described a family dispute, said the incident was isolated and said there was no further threat to the public. The court record later expanded that account with medical findings, witness statements, Testerman’s alleged admissions and the phone evidence. Police said Testerman admitted hitting Oliver with his fists and a metal tumbler. Witnesses told investigators that he became violent for no apparent reason. The facts placed the case in the category of domestic violence, but with a rare element: an alleged recording made by the accused.
Testerman’s own statements became important after he changed his plea. In court, he said he had abused acid for some time and attacked Oliver without reason. He acknowledged striking her until she died. He also said he had experienced hallucinations but understood the proceedings. Those statements helped explain why the final plea was not a simple guilty plea. The “guilty but mentally ill” finding allows mental health treatment in prison, while still leaving Testerman convicted of murder and subject to the full sentencing range.
Before the plea, the defense had looked toward an insanity argument. That strategy would have required showing that Testerman’s mental condition met Kentucky’s legal standard at the time of the killing. His attorney later said a defense expert found antisocial personality disorder and a likely psychotic episode tied to voluntary drug use. Prosecutors said Testerman’s psychosis history was connected to drugs. That assessment weakened the insanity route because voluntary drug use generally does not excuse criminal responsibility under the legal standard. The plea ended the need for jurors to decide that question.
The alleged recording also affected the human stakes for a trial that did not happen. Jurors would have been asked not only to weigh witness testimony and forensic findings, but also to watch the final moments of a 74-year-old woman’s life. Sanders said the guilty plea spared 12 jurors from viewing the video in full as part of a trial. For Oliver’s family, the plea removed the uncertainty of a verdict but left sentencing ahead. For the court, it shifted the focus from whether Testerman committed murder to how much punishment the law allows and the facts demand.
Oliver’s age and relationship to Testerman are expected to be central at sentencing. Prosecutors have emphasized that she was elderly, defenseless and attacked by a family member in a home where she should have been safe. The defense is expected to raise Testerman’s youth, drug abuse and mental health history. The judge may also hear more about the timeline inside the home, including who was present, what was said before the assault and what efforts were made to stop it. The recording may give the court the clearest account of the violence itself.
The case remains anchored in a single afternoon on Ridgewood Drive, but it now carries several legal questions into July: how the court will weigh the guilty but mentally ill plea, how much the drug-related mental health evidence matters and whether the state’s request for life will be granted. No trial date remains. No factual defense remains pending. The unresolved issue is punishment.
Sentencing is scheduled July 7 in Kenton County Circuit Court. The court will decide whether Testerman receives a term of years or life in prison for Oliver’s killing.
Author note: Last updated May 25, 2026.