According to the Baltimore Sun, correctional officer Sherman Lawrence is accused of helping two inmates stab a third inmate, 26-year-old Ronald Scott.
Lawrence is accused of ordering Scott into a recreation area with other inmates and then ordered everyone out of the room, except for Scott and three others.
Authorities say 24-year-old inmate Donte Smith and another man threw a sheet over Scott's head, and someone stabbed him in the head and body.
The bleeding inmate was ordered back into his cell, where he was found during a security check.
Officials say Smith has been charged with attempted murder and Sherman was fired.