A 14-year-old Brazilian boy died after injecting himself with butterfly remains — with police investigating whether it was part of a twisted online challenge, according to a report.

Davi Nunes Moreira started to vomit and then developed a limp after mixing a dead butterfly in water and injecting the liquid into his leg, according to the DailyMail.

The teen told his dad he hurt himself while playing — but then confessed what really happened when he continued growing sicker and was admitted to a hospital in Planalto, the report said.

His dad also found the syringe his son had used hidden under the boy’s pillow, according to the report.

Davi was rushed to another hospital in Vitoria de Conquista, the state of Bahia’s third-largest city, on Wednesday, but succumbed to his injuries.

The mysterious death — linked to possible toxins in the butterfly mix that caused his body to shut down as he went into septic shock — is making headlines across Brazil.

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However, authorities have not ruled out the possibility that the boy was participating in an unusual social media craze that proved fatal, the report said.