A Cayuga County jury found a man guilty of assaulting an Auburn Corrections Officer

A former New York City man has been found guilty of assaulting a corrections officer at the upstate prison where he's serving time for killing a man in a Queens fast-food restaurant 15 years ago.

Michael Brooks, 39, was an inmate at the Auburn Correctional Facility when he violently attacked and violently injured a Correction Officer in February 2011. It happened when the officer was searching Brooks' cell for contraband. The officer suffered a left rotator cuff injury which required two surgeries.

Brooks has a lengthy and violent criminal history. In 1998, he was convicted of shooting in killing a man in a Queens McDonald's during a robbery. He also slashed the face of a Correction Officer at a Queens jail. During his time behind bars, he has received almost 30 disciplinary violations, including prior assault on staff and weapons possession.

"Brooks was a stick-up man and a killer. He has proved himself incapable of living by society's rules even while incarcerated," said Chris Valdina, Chief Assistant District Attorney. "We will ask the Court to impose the maximum sentence of 25 to life. The mandatory life sentence will protect the rest of us, but we cannot forget that the brave men and women of DOCCS will still have to deal with this violent criminal."

The assault conviction means Brooks faces an additional mandatory sentence of between 12 to 25 years to life in prison.

Brooks is scheduled to be sentenced on March 14.

(Information from the Associated Press was used in this report.)