'How the f— is she still breathing?': Teen propped his phone into position then beat his grandmother to death with 'metal drinking tumbler'

Wyatt Testerman, a teenager, pleaded guilty but mentally ill to murdering his 74-year-old grandmother in October 2024. The victim was beaten to death in an unprovoked attack during which Testerman positioned his phone to record the assault, according to prosecutors.

The attack involved a metal drinking tumbler as the weapon. Court records indicate Testerman struck his grandmother repeatedly while she lay defenseless. During the beating, he made the statement "How the f— is she still breathing?" to the phone he had propped in place, suggesting he documented portions of the crime.

The plea of guilty but mentally ill carries distinct legal consequences from a standard guilty plea. Under this doctrine, recognized in many jurisdictions, Testerman admits to committing the acts constituting the crime but argues his mental health condition affected his criminal responsibility. This verdict typically results in commitment to a psychiatric facility rather than or in addition to prison time, depending on state statute and sentencing guidelines.

The nature of the crime—premeditated recording of a violent assault combined with an unprovoked killing of a family member—raises questions about Testerman's mental state and any psychiatric evaluations the court ordered. Prosecutors likely presented evidence of deliberation through the phone recording itself, which captured his narration of the beating.

This case illustrates the intersection of criminal intent, mental health defense, and modern evidence preservation. The defendant's decision to record his actions complicates claims of diminished capacity, though mental illness can coexist with self-awareness of criminal conduct.

The guilty but mentally ill plea resolves the case without trial while acknowledging Testerman's psychological condition. Sentencing will determine whether he receives institutional psychiatric treatment, incarceration, or both.

THE BOTTOM LINE: A teenager's guilty but mentally ill plea in his grandmother's murder case addresses both criminal culpability and psychiatric intervention, with