An influencer shot her boyfriend and three children before turning the gun on herself, prosecutors believe.
Cindy Tamez was found with her two-year-old son, Gustavo, inside a Jeep in Montemorelos, Mexico, on the morning of 30 September.
Her other two boys, 10-year-old Bruno and 11-year-old Christian, and her partner, Leodegario Moya Garza, were found dead at the family home a few blocks away.
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All five had suffered gunshot wounds.
A .38-calibre automatic pistol, a mobile phone and a cartridge were found inside the Jeep.
Just hours before the grim discovery, Cindy, 33, posted a clip from inside a moving car with the caption: “Not everyone knows my nasty side.

“I’d burn down my own house just to watch my neighbour’s go up in flames, even knowing I’d get f*cked over too.”
According to Nuevo León State Attorney General Javier Flores Saldívar, initial forensic investigations indicate that Tamez shot Leodegario, 29, and two of the children at home before leaving with the third child.
The two boys were found downstairs, behind a sofa in the living room.
Investigators believe they may have hidden there after hearing Tamez shoot their father.
Tamez is then believed to have killed the third child before taking her own life.
According to the investigation, the events took place after a gathering with family and friends the previous night.
Flores said evidence of alcohol consumption was found at the home, as reported by Need To Know.
On Saturday (3 October), a 14-year-old family friend who had stayed over after the gathering claimed to have seen Tamez shooting one of the victims.
Tamez “saw him and spared his life”, he reportedly said in his statement to police.

Leodegario was allegedly asleep when he was shot, according to some reports.
Prosecutors believe he and Tamez argued shortly before the killings.
Reporter Raymundo Elizalde told local media: “Several extramarital relationships involving the murdered man have come to light. So the investigation may be heading towards a crime of passion.”
Cindy, whose full name was Cinthya Abigail Tamez Rivera, was reportedly involved in lending money and organising informal savings schemes.
She also reportedly bought, sold and raffled items including vehicles, chains, watches and mobile phones.
She had tens of thousands of followers on social media, where she posted snapshots of her daily life, including off-road vehicles and parties, and appeared to project an image of affluence.

Some of her earlier posts included messages about getting revenge on people who had hurt her.
One read: “I can take it, but I can give it back twice as hard, so don’t think I give a f*ck – I can be twice as much of a c*nt as you.”
Another said: “I’m probably just as much of a piece of sh*t as you, or even worse, but I never screw someone over unless they’ve screwed me over first.”
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