MANCHESTER, NH – A city man is charged with selling cocaine and fentanyl to a local man who later died from an overdose.
Steven Hallock, 41, of 11 Congress St., was arrested Thursday on felony charges of one count each of sale of a controlled drug, death resulting, sale of fentanyl and sale of crack cocaine.
According to court records, Justin Nagy, 28, of 158 Dionne Drive, died on Aug. 3, 2025. Deputy Chief Medical Examiner Mitchell Weinberg deemed the cause of death to be fentanyl and cocaine toxicity, the two substances police say he obtained from Hallock on Aug. 2, 2025.
Hallock was arrested after SWAT swarmed his apartment building Thursday afternoon. Neighbor, Mike Martioski, live-streamed the incident from his cell phone.
It was clear to him it was a drug sale, he said, because he and his wife had seen hand-to-hand sales allegedly take place outside the three-story apartment building. He said they notified the landlord of what was happening. The 11 Congress St. building is owned by Alex Nikulin, who purchased it for $605,000 in March 2023, according to the city’s assessors’ database.
On Thursday afternoon, he said police and SWAT arrived. An officer, using a bullhorn, announced they had an arrest warrant for Hallock and for him to come out.
When he didn’t, Martioski said police fired a bean bag through Hallock’s third floor window and then sent a drone inside. He also said police fired off seven or eight tear gas rounds before sending an armed officer into the building.
“This is better than anything you see on Netflix,” Martioski said on the video. He posted three separate videos of the incident, some with colorful commentary.
Eventually, Martioski said police brought four people out of the apartment building.
Next-door neighbor Patricia Anglin says she and her husband welcomed the police presence.
“I live next door to the scene and had been warning the landlord for months about the activities of his tenant. We could see everything happening from our home. My husband even offered the responding officers hot coffee about halfway through the operation,” Anglin said.
Police also arrested Antoine Francis, 34, of 11 Congress St. He was standing outside the building when police arrived. He was charged with possession of heroin/fentanyl and crack cocaine. He also was charged with violating bail conditions set on a prior charge of possession of a controlled drug.
Both men were arraigned Friday in Manchester district court. Francis is free on $100 cash bail.
Hallock was ordered held without bail because the judge determined he was a danger to himself or others.
According to court documents, on Aug. 3, 2025 police received a 911 call concerning a suspected overdose at 158 Dionne Drive. When officers arrived, Manchester fire personnel told them Nagy was pronounced dead at 9:11 p.m.
His roommate told police he decided to check on Nagy after not seeing him for an extended period. When he checked on him in his bedroom, he discovered he was deceased.
He said he last physically saw Nagy about 8 p.m. on Aug. 1, 2025 when he arrived home from work. He didn’t see him on Aug. 2 but said he could hear him snoring all day.
In the bedroom, police said they found drug paraphernalia and two small plastic baggies that were determined to contain fentanyl and crack cocaine.
On Aug. 12, 2025 Nagy’s mother brought her son’s cell phone to police. On it they found texts between Hallock and Nagy, dating back to June 1, 2025. There appeared to be multiple drug transactions between the two, including one on Aug. 2, 2025, where Hallock agreed to sell Nagy a quantity of fentanyl and crack cocaine for $100, according to court documents.
Police said the phone also contained a photograph taken at 2:15 a.m. on Aug. 2, 2025 showing two small clear Ziplock baggies. One contained an off-white powdery substance consistent with fentanyl and the other, a white chunk-like substance consistent with crack cocaine. Police said they were the same baggies officers found in Nagy’s room.
Hallock and Francis are to return to court on Nov. 6 for probable cause hearings.