The girls allegedly used a knife they had stolen from the store in the fatal attack and were spotted in a kitchen aisle just moments earlier.
Footage of the stabbing, which was posted on Facebook and Instagram live, showed one girl armed with what appeared to be a knife as the victim approached and lunged at her.
Authorities later released a surveillance image of that girl, who is one of the 13-year-olds, as she fled the store in a bid to track her down after the stabbing.
Videos showed the group of girls fleeing the store in a getaway car as one of them screamed: ‘Just stabbed somebody at Walmart’.
‘We just stabbed that b***h in her heart. We don’t give a f**k.’
Authorities have not yet confirmed who was driving the car.
Police initially named the 13-year-old wanted over the stabbing in a Facebook post when they were trying to track her down. The other three girls were not named.
The victim’s identity has not been publicly released.
Authorities have also not revealed a motive for the attack but police believe the confrontation may have started at a nearby movie theater.
One of the 13-year-old girls was arrested on a second-degree murder charge and the three others on charges accusing them as principals to second-degree murder. They have all been booked into the juvenile detention center.
Calcasieu Parish Sheriff Tony Mancuso confirmed that investigators have videos of the fatal stabbing that the alleged attackers posted on Facebook and Instagram live.
‘They stole knives from the actual store where they were at. It is really heart-breaking when we have to come in and pick up the pieces because so many families are damaged after this,’ Mancuso said during a press conference.
‘Our whole case unfolded before us through live Facebook and Instagram… we have videos of everything that took place and it’s very disturbing.
‘The whole murder was played out on (social media) so, again, there appeared to be no remorse. It was very cold to see 12, 13, 14 and 15-year-olds acting this way and we as a society can’t tolerate it. We cannot let this plague and take over our community.’
The sheriff issued a plea for parents to ‘take control’ and said it was problem of ‘kids having access to weapons’.
‘This is the third homicide in six months that we’ve had that involved juveniles that range from 11 to 16 years old. They come from all backgrounds, all races. This is just a problem that we are having with kids having access to weapons,’ he said.
‘This is not something we can police ourselves out o… I just don’t feel like this is a police matter. This is a parenting issue.’