Joseph Ozment pleaded guilty to the 1992 murder of Rick Montgomery
He was released from prison after a pardon from Barbour.
As he closed out his second term as governor, Barbour granted "full pardons" -- meaning the convict's record is effectively wiped clean -- to more than 200 people found guilty of a variety of crimes. All four of the convicted murderers he pardoned were serving life sentences and worked as trusties at the governor's mansion.
"He ran the office of the governor as if it was Mississippi in the 1950s," said Hood. He said many of the inmates Barbour pardoned came from influential families or had connections to the Republican party.
"There's not any logical explanation other than it was just a whim, and by doing it on a whim at the last moment that's how he violated our Constitution," Hood said.
Barbour has defended his pardons. On Friday, he appeared on CNN's "John King USA," saying Ozment and the others have been rehabilitated.
"He has no obligation to do anything. He's been pardoned. He's a free man," Barbour said.