Judge Acquits Brother of Murder Due to Insanity | COURT TV

Court TV
Court TVMar 21, 2026

Why It Matters

The decision illustrates how robust psychiatric evidence can overturn a murder conviction, prompting law‑enforcement and prosecutors to reassess handling of severe mental illness in violent crimes.

Key Takeaways

  • Defendant diagnosed with severe psychosis by two expert psychiatrists
  • Surveillance footage captured struggle and murder of brother Joseph
  • DNA evidence linked defendant and victim to blood‑stained weapons
  • Court accepted insanity defense, acquitting the murder charge
  • Additional charges include unlawful weapon possession and animal cruelty

Summary

The New Jersey court sentenced David Hurtgen’s brother to acquittal on a first‑degree murder charge after accepting an insanity defense. The case centered on the February 22, 2015 killing of his younger brother Joseph in a Princeton apartment, a tragedy that unfolded before a stunned family and attracted extensive forensic scrutiny.

Prosecutors presented a trove of evidence: surveillance video showing the defendant and Joseph fighting, blood‑stained golf clubs and a kitchen knife, and DNA analysis confirming both men’s blood on the weapons. Autopsy reports detailed blunt‑force trauma to Joseph’s head and chest, while psychiatric experts—Dr. Gianni Pirelli and Dr. Vivian Schneidman—testified that the defendant suffered the most severe psychosis the former had seen in 22 years.

During a 911 call, the defendant described a “fit of madness” and refused to elaborate on the injuries, underscoring his mental state. Dr. Pirelli described the defendant’s delusional visions and chronic psychosis, and the court cited his 1,500‑evaluation track record to substantiate the insanity finding.

The ruling underscores the weight courts give to expert psychiatric testimony when mental illness clouds criminal intent. While the murder charge was dismissed, the defendant still faces convictions for unlawful weapon possession and animal cruelty, highlighting that an insanity verdict does not erase all legal accountability.

Original Description

In a New Jersey courtroom, following testimony from a key witness, the judge announced his verdict in the case against Matthew Hertgen. Accused of killing his brother, Joseph Hertgen, a former University of Michigan soccer player, Matthew was found not guilty by reason of insanity.
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