PORTLAND — A Bangor man serving a life sentence for fatally stabbing a teenager along the city’s waterfront three years ago is appealing his conviction and sentence.

The Maine Supreme Judicial Court is hearing arguments today in Colin Koehler’s appeal.

The 37-year-old Koehler was sentenced to life in prison for the 2009 stabbing death of 19-year-old Holly Boutilier of Old Town. Her bloody body was found in an abandoned shack under the Interstate 395 bridge that crosses the Penobscot River.

In his appeal, Koehler is arguing that the judge who presided over his trial erred in allowing certain evidence, in the instructions to the jury, in denying his motion for a new trial based on new evidence, and in giving him a life sentence.