Sidnei Ramis de Araújo (1970 - January 1, 2017) was a Brazilian laboratory technician who committed a mass shooting at his ex-wife's home in Campinas, Brazil on January 1, 2017. ^[undefined]

Shortly after midnight on January 1, 2017, Sidnei stormed into a house party his ex-wife, Isamara Filier was hosting and killed 11 people, including Isamara and eight-year-old son, before shooting himself in the head in Campinas, Brazil. ^{[undefined] [1]}

Before the shooting, he had texted a friend saying, "Im going to take as many people of that family with me as possible."

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He had been involved in a legal battle over his son and was not happy.

^[1] Sidnei left audio and a written letter justifying his actions for the shooting.

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