ROCHESTER, N.Y. — A man convicted of killing Rochester Police Officer Anthony Mazurkiewicz was caught on surveillance video attacking a corrections officer at Coxsackie Correctional Facility, WHAM reports.
Kelvin Vickers, 24, is serving a life sentence for multiple crimes, including the July 21, 2022, ambush shooting that killed Mazurkiewicz and wounded his partner, Officer Sino Seng. The officers were conducting an undercover investigation into a double homicide when they were shot, according to WHAM. Vickers was convicted in connection with both incidents.
Vickers had been incarcerated at Coxsackie Correctional Facility in Greene County since November 2024 before being transferred on Jan. 6, according to the New York State Department of Corrections and Community Supervision (DOCCS).
Corrections Officer Corey Clark, who has worked at the facility for seven years, was the victim of the assault, WHAM reports.
Clark said he was working overtime when Vickers attacked him.
“I was simply just letting him out of his cell to go to rec that morning, and you see in the video, if you look close, he comes out with his right hand balled into a fist where he’s got the cutting device or instrument,” Clark told WHAM. “I do the run-of-the-mill ‘pat frisk’ — actually, I do a very lackadaisical ‘pat frisk’ to be honest — and then he just turns and starts assaulting me.”
Clark also revealed that an internal investigation uncovered that Vickers had premeditated the attack.
“A subsequent investigation in our facility found that he made a phone call the night before planning this in entirety, that he was going to attempt to kill the first CO that let him out of his cell the next day,” Clark told WHEC.
You can learn a lot from phone calls, such as plans for contraband being introduced to your facility or planned assaults on staff or other inmates. In the video below, Gordon Graham discusses the importance of checking inmate’s phone records.
Mazurkiewicz’s widow, Lynn, said watching the video reaffirmed her belief that Vickers remains a threat.
“It confirms my belief that he is absolutely unsuitable to live in most environments,” she told WHAM. “Vickers was being let out for his rec time, which means in a cell 23 hours a day, and still managed to get a weapon to go after another human being — a guard.”
Clark described the moments of the attack as feeling like “forever.”
“You’re just kind of waiting and just holding, defending yourself until the rest of the cavalry comes, so to speak. That’s really all you can do,” he said. “You’re just sitting there, inevitably waiting for somebody else to show up and help.”
Following the attack, DOCCS said Vickers was transferred twice. He is currently being housed at Attica Correctional Facility in Wyoming County.
Greene County’s district attorney confirmed an ongoing investigation into the attack. Several charges are expected to be presented to a grand jury.
