The lawyer for a man convicted of first-degree murder earlier this summer has filed notice to appeal.

A Queen's Bench jury found Neil Yakimchuk, now 34, shot and killed Isho Hana in Saskatoon on April 15, 2004.

He was sentenced to life in prison with no chance of parole for 25 years, which he is now serving in Edmonton.

Since that verdict, a Supreme Court of Canada ruling has cast doubt on confessions attained through so-called "Mr. Big" police sting operations.

When Yakimchuk testified at his trial, he claimed that his account of murdering Hana was borrowed from a co-accused for the purposes of impressing the person he thought to be an organized crime boss, but who was an undercover officer.

The high court noted several problems with the Mr. Big strategy in its July 31 ruling overturning the conviction of Newfoundland man Nelson Hart in the deaths of his young daughters.