US authorities have decided not to charge an heir to the Fiat auto fortune who was arrested for allegedly faking his own kidnapping to pay for a weekend of debauchery, officials said on Thursday. As per several US media outlets, lapo Elkann, the grandson of legendary Fiat founder Gianni Agnelli, tried to make his family believe he had been kidnapped when he ran out of money during a two-day bender of sex and drugs. The 39-year-old Italian playboy reportedly spent that time with a transgender prostitute.