At the news conference today, McMullen also revealed new details about the fatal Dec. 23 shooting in Tupelo. According to police the suspect fled the Tupelo bank in a grey sedan, but was later reported to be in a white SUV.
When the two officers, Gale Stauffer and Joseph Maher, responded to the bank alarm, they saw a white SUV near the bank and stopped the vehicle. The suspect was in a grey sedan behind the SUV. While the officers were dealing with the driver of the white SUV, the suspect ambushed the two officers, fatally wounding Stauffer.
At the press conference today, Stauffer's wife, Beth Stauffer thanked law enforcement officials for their hard work.
"Numerous people did not get to celebrate Christmas with their families, because they were trying to bring peace to our family," said Beth Stauffer.
Earlier this week residents in Tupelo held a candlelight vigil for Stauffer.
Flags were lowered to half-staff in memory of Stauffer, an army veteran of the Iraq War, and father of two young children.
"I'm at peace knowing Gale died doing what he loved," his wife said.
Stauffer was a combat veteran of the Louisiana Army National Guard, and he had served with the Tupelo Police Department for eight years, according to the Officer Down Memorial Page.
ABC News' Mike Levine and Ben Krolowitz contributed to this report.