The teenager, who reportedly appeared in court but has kept his identity concealed, said he was unsure of how to use the flare that went into the San Jose supporters section, inadvertently killing Kevin Beltran Espada after it stuck him in the face.
"We were celebrating the (Corinthians) goal. 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," the unnamed 17-year-old told Globo. "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.''
Two of the 12 fans in Bolivia have been formally accused of setting off the flare that killed Espada, with the others being held as accomplices.
After the incident, CONMEBOL, the South American confederation, announced that Corinthians’ fans will be banned from attending their matches for the next 60 days, a punishment that Corinthians, the current Copa Libertadores champion, has appealed.