NEW : Unidentified person who left $ 300k in cab is a famous professional , age 28 . TO : ` ` I did the right thing , that 's it , '' driver tell KLAS . TO : Gambler was devastated at his absentmindedness , cab firm official says . TO : ` ` They call us sin city . But it 's not . It 's angel city , '' cab firm says .
NEW : Unidentified gambler who left $ 300k in cab is a famous professional , age 28 . NEW : `` I did the right thing , that 's it , '' cabbie tell KLAS . NEW : Gambler was devastated at his absentmindedness , cab firm official says . NEW : `` They call us sin city . But it 's not . It 's angel city , '' cab driver says .