Man killed in Deer Park crash, Suffolk police officer injured while responding

Man killed in Deer Park crash, Suffolk police officer injured while responding. Suffolk County, Long Island.

Updated Jul 14, 2025
CRITICAL INCIDENT
Deer Park
Town
Deer Park
County
suffolk County
Reported
Source
News Sources

Map showing incident location at 40.7800, -73.3000 Incident location, Long Island

What Happened

A fatal two-vehicle crash in Deer Park early Monday morning claimed one life and led to a second collision involving a responding police officer, according to Suffolk County Police.

Anthony Guglielmo, 56, of Deer Park, was driving a 2013 Mini Cooper northbound on Deer Park Avenue when it collided with a 2011 Jeep Liberty traveling westbound through the intersection at Grand Boulevard at 3:40 a.m., police said. Guglielmo was transported to Good Samaritan Hospital where he died from his injuries.

The driver of the Jeep, Stefanie Russo, 37, of Hauppauge, was also taken to Good Samaritan Hospital with non-life-threatening injuries, according to officials.

Minutes after the initial crash, a Suffolk County police officer responding to the scene became involved in a second collision at 3:51 a.m., police said. The officer was traveling southbound in a marked police vehicle toward the crash site with lights and sirens activated when the patrol car collided with a 1997 Ford van at the intersection of Deer Park Avenue and Lake Avenue, according to officials.

The van was traveling eastbound at the time of the collision, police said. Both the police officer and the van driver were the only occupants in their respective vehicles and were transported to Good Samaritan Hospital Medical Center in West Islip with injuries not considered life-threatening, according to officials.

The crashes forced authorities to shut down Deer Park Avenue between Grand Boulevard and Lake Avenue for four hours. The roadway reopened at 7:45 a.m., police said.

Location & Road Context

The fatal collision occurred at the intersection of Deer Park Avenue and Grand Boulevard in Deer Park, a major north-south corridor that connects multiple Nassau and Suffolk County communities. Deer Park Avenue serves as a primary route through the hamlet, with Grand Boulevard marking a significant east-west cross street in the area.

The secondary crash involving the responding officer happened approximately 11 minutes later at the intersection of Deer Park Avenue and Lake Avenue, less than a mile from the original crash site.

Suffolk County Police First Squad detectives are investigating both crashes. Anyone with information about the incident is asked to contact First Squad detectives at (631) 854-8152.

No charges or arrests have been announced in connection with either collision at this time.

Disclaimer: Incident information on this page is compiled from public sources including police reports, traffic agencies, and news outlets. It is provided for informational purposes only and may not reflect the most current status of this incident. Do not rely on this information for legal, insurance, or emergency decisions. For emergencies, call 911.