Andrew Lansing, a corrections officer at a prison in Chillicothe, Ohio, was killed Christmas Day in what state officials say was an "inmate assault."

The incident happened on Christmas morning at the Ross Correctional Institution. Officials said Lansing died following an “inmate assault” at the high-security prison in Ross County. In a press conference Friday, ODRC Director Annette Chambers-Smith said that Lansing, a father and husband, had volunteered to work overtime on Christmas.

Ross Correctional Institution Officer Andrew Lansing was known as a great guy to his family and a fair and firm guard to inmates, his brother said.