Romeo Cormier was sentenced to 18 years in prison in August 2011 on six charges related to the kidnapping and sexual assault of a woman in Moncton. (Andrew Vaughan/Canadian Press)

A Moncton man, convicted of kidnapping a woman at knifepoint in 2010 and holding her captive for nearly a month while he sexually assaulted her, has lost his bid to appeal his conviction and sentence.

The Supreme Court of Canada has dismissed the application of Romeo Jacques Cormier for leave to appeal without costs.

No reasons are given.

Cormier was sentenced to 18 years in prison in August 2011 after a jury found him guilty of six charges, including kidnapping, sexual assault, unlawful confinement, robbery with a weapon, assault with a weapon and uttering threats.

The victim, who cannot be identified because of a publication ban, disappeared from a downtown Moncton shopping centre on Feb. 26, 2010, and was missing for nearly a month.

During the trial, the woman, who is in her 50s and originally from Newfoundland, testified that she was held in a rooming house basement for 26 days and repeatedly sexually assaulted and threatened before she managed to escape.

Cormier, who is in his mid-60s, had argued his sentence was too long and given his age, a death sentence.

He also claimed he was an "innocent man" who was wrongly convicted. He alleged he was found guilty in the media before ever going to trial and that the Crown conducted "a serious character assassination on him," and withheld evidence.

Cormier had previously applied to the Court of Appeal of New Brunswick for leave to appeal, but was denied.

Justice Richard Bell ruled the trial judge was "beyond reproach" and said he agreed with the trial judge's characterization of the crimes as "horrendous."

The Crown had been seeking a sentence of life in prison.

The defence had recommended a sentence of 10 to 12 years, arguing that Cormier suffers from narcissism and didn't deserve a life sentence.