Detectives are trying to find Ana's uncle to question him about the gun after it emerged the serial number had been scratched off.
The tragedy happened on Sunday afternoon at Ana's home in the Santa Luzia district of Criciuma, which is 600 miles south of Rio de Janeiro. She never got involved in dangerous games and there was no history of depression either.'Earlier this month gambler Jefry Caicedo Toledo, 21, died in Colombia after taking part in a game of Russian Roulette with two friends.
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His friends were arrested after the incident and a Smith & Wesson .32 calibre handgun was seized by the police.
Russian Roulette, which was dramatised in the 1978 Vietnam War film The Deer Hunter, involves loading a revolving chamber pistol with a single bullet.
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Police chief Rafael Iasco said: 'The dead girl was found lying on the ground with the gun close to her chest.'There was another teenager there who told officers they were talking when she took the gun out and began to play Russian Roulette.'Sadly on one of the occasions she pulled the trigger she shot herself in the head.'We're still waiting for the results of forensic tests but the information we have at the moment points to this being a game that went fatally wrong,' said Mr Iasco.
Ana's mother was taken to hospital after the news was broken to her and is suffering from shock.
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