PORTLAND — Maine’s highest court is hearing an appeal from a Maine man who’s serving a 35-year sentence for fatally shooting a rival on a Bangor street.

Justices on Thursday will hear the appeal of 21-year-old Zachary Carr, who was convicted last year in the January 2010 death of 19-year-old John “Bobby” Surles. During Carr’s trial, a prosecutor said Carr “executed” Surles while he was lying helplessly on the ground, but Carr testified his gun accidentally discharged while defending himself.

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In his appeal, Carr contends the lower court erred by not granting him a new trial based on the state’s failure to disclose a recorded interview with a key witness.

He’s also challenging whether there was sufficient evidence to convict him and how various factors were determined in calculating his sentence.