[6] In the same day, one of the killers posted a series of photos in a social media platform, where he appeared with a skull mask, holding the firearm he would later use and doing a gun sign with his hand against his head.

[8] The crime occurred at around 9:40 a.m. local time on a Wednesday, March 13, 2019, in the Professor Rual Brasil State School, in Suzano, Greater São Paulo.

He then turned around and began shooting at two school staff members as well as several students at a distance of approximately 3 feet (0.91 m) in front of him, before entering the main patio in search of more potential victims.

By this time, Henrique appeared on camera entering the building in a hurry while holding several weapons, including a composite bow, which he eventually dropped on the floor and was unused in the attack.

He approached the wounded victims lying on the ground and struck them with a hatchet, at which point, fleeing students started to run from the patio towards the school entrance hall.

[9] The school was locked down by police, who searched it and found a .38 caliberrevolver, speedloaders, a crossbow, a composite bow, Molotov cocktails, a hatchet and a wired bag.

[10]Guilherme Taucci Monteiro (July 5, 2001 – March 13, 2019), then 17 years old, was an ex-student of the school and had dropped his studies due to bullying.

The father of Luiz Henrique, his best-friend and with whom he invaded the school, had promised to get him a job in the same service of Square cleaning and conservation in São Paulo.

According to his grandfather, Taucci went to a LAN house with Henrique and did not find it weird that he had money for games or online shopping, because his grandson did some odd jobs.

[12] Their days consisted of walking through the mall and regular visits to the neighborhood's LAN house, where they used to play first-person shooter games.

César Expedito, a friend of Henrique for 14 years, stated that he liked playing ball and video-games and that he never displayed any aggressive behavior.

A video showed Taucci and the third suspect going to a shooting range and training shots with air soft guns and bow and arrow, five days before the attack.

[33] Damares Alves, Minister of Women, Family and Human Rights, lamented the event and offered support by the Ministry.

[34] Rodrigo Maia, President of the Chamber of Deputies, expressed his solidarity towards the families of victims and said that "it's time for Brazil to unite forces and competences to understand what happened and prevent new massacres like that one from occurring".

[26][37] São Paulo's federal congressman Júnior Bozella wanted to create a bill as a reaction to the tragedy, justifying that violent video games can lead the youth to commit "massive acts of violence".

[42] The lunch lady Silmara Silva de Moraes, that helped hide the students during the attack, received honors from the governor João Dória in 2020.

[43] The Suzano massacre would go on to inspire multiple copycats, with Henrique and Taucci being mentioned as an influence for men responsible for or suspected in other mass killings.