A 17-year-old Corinthians fan has admitted to lighting the flare which killed a young San Jose supporter during last week's Copa Libertadores clash in Brazil.
Kevin Beltran Espada, 14, was struck by the flare during the 1-1 draw and later died in hospital due to head injuries.
Following the tragic death of the Bolivian youngster, the South American governing body (CONMEBOL) imposed a crowd ban on Corinthians, preventing all supporters from attending the remaining Copa Liberatodes matches this season.
The culprit, whose identity was protected due to his age, revealed in an interview with Brazilian TV station Globo that he did not know how to use a flare.
"We were celebrating the [Corinthians] goal," he said. "I took the flare from my bag, pulled on the cord, didn't quite know how to use it. It took off in the direction of the Bolivian fans."
"I feel like I'm the worst person in the world. I don't know what I'll do with my life, I deeply regret what happened.''
The investigation into Espada's deaths is expected to take up to 60 days, with Corinthians' punishment expected to be reviewed at that point.