Sayreville School Custodian Charged, but Vigilante Interference Weakened Case

Prosecutors say critical evidence was lost due to independent sting operation by private citizens.

Apr. 16, 2026 at 11:28pm

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An extreme close-up photograph of a pair of handcuffs against a stark black background, conceptually representing the investigation into alleged criminal behavior.Vigilante interference in a sensitive criminal investigation has weakened the case against a school custodian accused of online predatory behavior.Middlesex Today

A 39-year-old custodian at Sayreville War Memorial High School in New Jersey has been charged with attempting to endanger the welfare of a child, but police say the case was weakened by interference from a 'self-identified vigilante group' that exposed details about the suspect online before law enforcement could complete their investigation.

Why it matters

This case highlights the risks and unintended consequences when private citizens take matters into their own hands and interfere with sensitive criminal investigations. Prosecutors warn that such vigilante actions can compromise evidence, hinder the pursuit of justice, and prevent law enforcement from holding offenders fully accountable.

The details

Kevin Coposky, of Old Bridge, was charged with third-degree attempt to endanger the welfare of a child. Before police could finish investigating the initial tip accusing Coposky of trying to meet children online for sexual activity, a 'self-identified vigilante group' independently contacted the suspect and publicly shared disturbing details about his alleged conduct on social media. This interference directly impacted the investigation, causing prosecutors to say they were unable to fully develop and secure critical evidence to pursue the full scope of potential charges.

  • On April 9, Sayreville Police were called to the high school after accusations involving Coposky.
  • Coposky was placed on leave and banned from all school facilities, pending the outcome of the investigation.
  • Coposky was arrested on Wednesday.

The players

Kevin Coposky

A 39-year-old custodian at Sayreville War Memorial High School who was charged with third-degree attempt to endanger the welfare of a child.

Linda Estremera

The Middlesex County Prosecutor who warned that the vigilante group's actions directly interfered with and impeded the sensitive and ongoing criminal investigation.

Thomas Montagna

The Old Bridge Police Chief who joined the prosecutor's statement discouraging such vigilante actions.

Daniel Plumacker

The Sayreville Police Chief who also joined the statement discouraging vigilante interference with law enforcement investigations.

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What they’re saying

“These actions directly interfered with and impeded a sensitive and ongoing criminal investigation. As a result, investigators were impeded and thus, unable to fully develop and secure critical evidence to pursue the full scope of potential charges.”

— Linda Estremera, Middlesex County Prosecutor

“We strongly discourage such vigilante actions, which can compromise investigations, hinder the pursuit of justice, place the safety of officers in jeopardy, and ultimately detract from law enforcement's ability to hold offenders fully accountable.”

— Thomas Montagna, Old Bridge Police Chief

What’s next

Anyone with potential information on the Coposky case is asked to call the detective hotlines for the Old Bridge Police Department, Sayreville Police Department, or Middlesex County Prosecutor's Office.

The takeaway

This case serves as a cautionary tale about the risks of private citizens interfering in sensitive criminal investigations. While the public may feel compelled to take action, such vigilante efforts can ultimately undermine law enforcement's ability to properly investigate and prosecute offenders to the fullest extent of the law.