A Christchurch man who murdered his ex-partner in a revenge-driven attack has lost an appeal against his murder conviction and sentence.

Nikki Roper is serving a life sentence with a minimum non parole period of 14 and a half years for the murder of Alexsis Tovizi in 2010.

He appealed against his murder conviction on several grounds: that his trial lawyer made errors, the judge admitted prejudicial evidence and failed to explain certain points to the jurors, and that he was unfairly prevented from sitting next to his lawyer during the trial.

The Court of Appeal has rejected each of the grounds as having no merit.