A New Hampshire prep school graduate convicted of sexually assaulting a 15-year-old freshman as part of a game of sexual conquest is seeking a new trial, saying his former lawyers were ineffective.

Twenty-year-old Owen Labrie was convicted in August of misdemeanor sex assault charges and a felony charge of using a computer to lure an underage student for sex. The felony carries the mandate to register as a sex offender for life. He was sentenced to a year in jail.

In her motion, Jaye Rancourt says Labrie's lawyers didn't challenge the computer offense until after his trial and conviction.

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His former lawyers included J.W. Carney, who also represented Boston gangster James "Whitey" Bulger. A message was left Wednesday seeking comment from Carney.

Labrie was arrested in 2014 days after graduation from St. Paul's School in Concord, NH.