A 19-year-old Kentucky man, Wyatt Testerman, has pleaded guilty but mentally ill to the brutal murder of his 74-year-old grandmother, Cheri Oliver, in October 2024. The guilty plea was entered during a hearing in Kenton County Circuit Court on Tuesday, where Testerman admitted to attacking his grandmother in a violent and unprovoked assault.
The Brutal Attack
Testerman’s attack on Cheri Oliver was horrifying. He struck and kicked her more than 50 times, including repeatedly stomping on her, before ultimately killing her by beating her head in with a metal drinking tumbler. The assault took place at the family residence on Ridgewood Drive in Erlanger, Kentucky. Testerman’s violent actions were unprovoked, and investigators later found that he had been struggling with substance abuse issues at the time.
Testerman confessed to the crime, acknowledging that he had been abusing acid (LSD) for an extended period. In court, he reportedly said, “I had been abusing acid for quite some time. Without reason on that date, I attacked my grandmother, striking her numerous times and killing her.”
Witnesses and the Gruesome Details
Authorities learned that Testerman had set up his cellphone before launching the violent attack. He reportedly shoved Cheri Oliver to the floor, then repeatedly beat her with his fists and the metal tumbler, recording parts of the assault on video. Testerman’s mother, who witnessed the attack, tried to intervene by hitting her son with a cane, but it was too late.
Witnesses described Testerman as becoming violent “for no apparent reason,” and at one point during the assault, he checked his grandmother’s pulse and reportedly said, “How the f— is she still breathing?” before continuing the attack. Oliver suffered more than 40 strikes and around 12 stomps, ultimately dying from blunt force trauma to the head.
Legal Proceedings and Mental Health Issues
Initially, Testerman had planned to pursue an insanity defense during his trial. However, his defense attorney later revealed that Testerman had been diagnosed with antisocial personality disorder and was likely under a psychotic episode due to his voluntary drug use at the time of the attack. This, however, did not meet the legal definition for insanity.
During the plea hearing, Testerman stated he was experiencing hallucinations at the time of the attack, but he understood the legal proceedings. He said, “I didn’t spend too much time thinking in reality.” The court was also informed that Testerman’s history of psychosis was strongly linked to his substance abuse issues.
Sentencing and Future Consequences
Testerman’s plea will allow him to receive mental health treatment during his incarceration. Prosecutors have stated they will pursue the maximum penalty of life in prison. His sentencing hearing is set for July 7, where Judge Patricia Summe will determine his prison term, which could range from 20 to 50 years or life.
This tragic case has left the community in shock, with family members reeling from the senseless violence that led to the death of a beloved grandmother.
