Copiague homeowner charged after alleged stabbing in leg assault

What began as a verbal dispute inside a Copiague home ended with a 28-year-old man suffering a severe leg laceration and a 41-year-old homeowner facing felony charges. Police said the argument escalated quickly at a Haven Lane residence tied to David McCarthy of 233 Mariners Way.

Suffolk County police said the confrontation happened at about 5 p.m. Thursday, June 4, 2026. Detectives said McCarthy allegedly stabbed the man in the leg during the dispute, then fled before officers arrived. The victim was taken to a local area hospital for evaluation and treatment, and no other injuries were reported.

McCarthy was later located and arrested without incident, police said. He was charged with Assault in the First Degree and Criminal Possession of a Weapon in the Fourth Degree, charges that reflect how seriously investigators viewed the attack. He was scheduled to be arraigned June 5, 2026, at First District Court in Hempstead.

The case underscores how quickly a domestic or neighbor-on-neighbor argument can become a violent crime scene inside a residential block. A home on Haven Lane and a second address on Mariners Way were suddenly tied to a felony investigation, turning an ordinary Copiague neighborhood dispute into a matter for detectives, emergency responders and the courts.

The arrest also came during a busy stretch of serious police activity across the county. The Suffolk County Police Department’s press-release feed showed a shooting in Greenlawn on June 4 and an update on a Mastic Beach shooting from June 1, adding to the sense of unease for residents already seeing multiple violent incidents surface in early June.