The police have identified the six victims as three nine-year-olds Evelyn Dieckhaus, Hallie Scruggs and William Kinney as well as Cynthia Peak, 61, a substitute teacher, Mike Hill, 61, a custodian, and Katherine Koonce, 60. Ms Koonce was the head of school, as written on the school website, and according to her LinkedIn, she worked at the school since 2016.
Police also named the suspect as 28-year-old Audrey Elizabeth Hale, who identified as a transgender woman.
However, police spokesperson Don Aaron declined to elaborate on how the attacker currently identified.
The 28-year-old, who was a Nashville resident and once a student at the Covenant School, killed the three people before police shot her dead.
Hale entered the school by shooting down a door and was armed with two “assault-style” rifles and a pistol.
READ MORE: Amazon’s 3-day sale is now on – top deals on electronics, home and fashion
Upon getting news of the incident, police rushed to the scene at 10.13am (4.13pm UK time) and they shot the attacker dead at 10.27am (4.27pm).
In one of the several news conferences, it was revealed that Hale had thoroughly planned out the deadly attack.
The attacker was found with detailed maps and surveillance, police said.
Metropolitan Nashville Police Chief John Drake told reporters: “We have some writings that we’re going over that pertain to this date, the actual incident.
“We have a map drawn out of how this was all going to take place.”
The shooter had no previous criminal record, according to the chief.
Mr Drake said his investigators are working on a possible motive but he declined to reveal any speculations on Monday afternoon.
“There’s right now a theory that we may be able to talk about later but it’s not confirmed,” he said.
Asked specifically if Hale’s identity could have factored into the killer’s motive, the police chief said: “There is some theory to that, we’re investigating all the leads.”
Hale was heavily armed who said the shooter had two AR-style weapons and a handgun.
Two of those three weapons were legally obtained in the Nashville area, the police chief added.
Hale was confronted by five officers and two of them opened fire, killing the attacker, authorities said.
A car near the school helped identify Hale.
Mr Drake told reporters: “There was a vehicle that was nearby that gave us clues as to who she was.”
He added that officers are currently combing through Hale’s home after making contact with her father.