Convicted cop killer Kelvin Vickers is now accused of more violence.

Vickers killed Rochester Police Officer Anthony Mazurkiewicz and injured another officer in July 2022 and now he’s allegedly assaulted a correction officer.

The correction officer he’s accused of assaulting is speaking out about fighting off an attack in prison.

“So simply, I was going down to his cell to let him out for recreation,” said Corey Clark, who is employed as a correction officer at Coxsackie Correctional Facility. 

Prison cameras appeared to capture the exchange that Clark says felt like lasted forever.

“I pat, frisk and I send him on his way, and he decides he's just going to turn and start assaulting me,” claimed Clark. “No real prior provocation or anything like that. Just out of the blue. If you look at the video, he comes out with his right hand balled in a fist. Whatever cutting instrument he had was in that hand.”

Clark has been a New York state correction officer for nine years, with the last seven at the Greene County facility.

“[I was] completely caught off-guard when he hit me in the face initially,” Clark said. “So, then it was immediately just, duck and cover my face for the most part, because, I mean, my body can withstand more blows or whatever. I didn't even know he had the weapon at first. Like, I didn't know that I was even cut until they sent me to medical after the fact.”

Clark was left with several facial and head wounds. Prior to this, Clark did not know Vickers’ history. Now he’s learned that Vickers killed Mazurkiewicz and wounded Officer Sino Seng. He was convicted of those crimes and killing two other people.

In February 2024, a judge sentenced Vickers to life in prison without the possibility of parole.

“After I found out that he murdered a cop, had no expectations of ever getting out of prison or seeing the light of day again, it was kind of one of those things like, well, he's got nothing left to lose, so why not, right?” said Clark. 

Asked if he’s feels safe working in the prison, Clark answered, “No, I do not. Obviously HALT, being the way that it is, understaffed to begin with. Now we're further understaffed. Now there's like an underlying hostility because they've been locked in for two to three weeks.”

It’s why Clark supports his brothers and sisters who were striking and calling for safer working conditions.

He took two weeks off to recover before returning to work. He says physically he is OK, but otherwise?  

“No. Mentally, no. Not ever going to recover from that,” said Clark. “Obviously, physically I will. The plastic surgeons did a great job at what they do, but mentally, no, never the same again. There's always going to be that nervousness, hesitation, unsettling feeling of going back into work every day. But unfortunately, bills need to be paid.”

State records show Vickers was transferred to Attica State Prison earlier this month.

Greene County District Attorney Joseph Stanzione says his investigation is complete and the case is going to be presented to a grand jury. Vickers is expected to be charged with felony assault and promoting prison contraband described as a weapon of some sort.

Stanzione adds that the correction officers are dealing with this sort of violence on an almost a daily basis and he regularly presents similar cases to the grand jury.