A little more than three weeks after being sentenced to life in prison for the second-degree murder of Bob Olson, Mark Lange is appealing his conviction.

Lange's lawyer, Andre Roothman, filed the notice of appeal in court Tuesday.

'The grounds for appeal are that the jury's verdict was one that a properly instructed jury judicially could not have reasonably have reached,' read court documents.

Lange is seeking an order that would set aside his conviction and an order of acquittal.

Lange, as well as Dean Boucher, was found guilty of Olson's second-degree murder last June following a four-week jury trial.

It will be 10 years before Lange is eligible for parole, while Boucher will have to serve 15 before he's eligible for parole.

Over the course of the trial, the 12-member jury heard that Lange and Boucher had been drinking together on Dec. 23, 2004 before they went into Olson's Caribou Hotel in Carcross that evening.

Boucher and Olson got into a fight when Olson wouldn't lend Boucher his truck.

At one point, Lange held Olson, who was 64 at the time, down and kicked him. After stealing items from the hotel, Boucher and Lange put Olson's body in the back of his truck and drove toward Whitehorse.

They stopped along the Carcross Road, with Boucher attempting, unsuccessfully, to perform CPR on Olson.

When they got to the Wolf Creek subdivision, Boucher dumped Olson's body in a ditch, with Lange covering it in snow.

After the truck got stuck in the snow near the area, the pair walked to McCrae. When they couldn't get help towing the truck, they called a cab and went downtown.

At the sentencing hearing, Boucher told the court Lange's only involvement was driving the truck they had placed Olson's body in.

Yukon Supreme Court Judge Leigh Gower concluded that Boucher was primarily responsible for beating Olson, but that Lange had done nothing to intervene in the fight and didn't leave when he had the opportunity.

At the beginning of the four-week trial, Crown prosecutors turned down both Lange's and Boucher's offer to plead guilty to manslaughter.