Man arrested after stabbing at Greenport gas station
A dispute at the Patriot Gas Station on Main Street left Mario Viera wounded and William Mokus under arrest after police say a pocketknife was used.
A fight outside the Patriot Gas Station on Main Street in Greenport ended with one man injured and another under arrest after police say the argument turned into a stabbing. Suffolk County police said the confrontation happened last Friday, June 26, 2026, between 33-year-old William Mokus and 34-year-old Mario Viera.
Investigators said Mokus pulled out a pocketknife during the dispute and stabbed Viera. Viera suffered a wound that required medical attention, though police did not immediately say how serious the injury was or how he was doing afterward.
Police arrested Mokus at the scene, then processed him at Southold Police Headquarters. The rapid arrest kept the case close to the site of the incident, instead of turning into a wider search across the North Fork.
The assault took place at a busy village gas station on Main Street, a setting that made the violence especially visible in a compact community where summer traffic and weekend visitors can quickly magnify any street-level confrontation. Greenport’s Main Street is one of the village’s most familiar public corridors, and a knife attack there drew immediate attention because it happened in an everyday stop where residents and visitors regularly pass through.
Police did not say what triggered the argument, whether anyone else was involved, or whether alcohol or any other factor played a role. Even without those details, the case points to the kind of fast-moving conflict that can unsettle a small waterfront village, where public safety concerns often center on whether a routine stop can turn violent in an instant.
The incident leaves Mokus facing arrest after a confrontation that police say began as an altercation and escalated into a stabbing. For Greenport, the case is a reminder that even a brief fight at a gas station can carry immediate consequences in a place where Main Street remains one of the community’s most visible public spaces.
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