The Supreme Court of Canada will not review the sentences Dennis Cheeseman and Shawn Hennessey -- the two men convicted in the shooting deaths of four Mayerthorpe RCMP officers in 2005.

Dennis Cheeseman and his brother-in-law Shawn Hennessey pleaded guilty to manslaughter in the deaths of the four constables -- Anthony Gordon, Leo Johnston, Brock Myrol and Peter Schiemann.

They admitted to assisting James Roszko by giving him a gun and a ride back to his farm just hours before the shooting deaths of the officers.

Chesseman was sentenced to 12 years and Hennessey received a 15-year sentence.

The two men asked the Alberta Court of Appeal to shorten their sentences, but their requests were denied.

"What my thought right now is that they will give it up and they will take the short amount of sentence like the men they are not," said Grace Johnston, Leo Johnston's mother.

The fatal shootings on March 3rd, 2005 in Mayerthorpe were followed by a massive public memorial, numerous court dates, and a fatality inquiry.

"It's the constant reminder that someone who was very, very important and an important part of your family was taken in just such a horrific way," said Grace.

Hennessey's father has maintained that his son and Cheeseman were victims of James Roszko, and only did what they did because they feared for their own safety.

The two men's appeal options have now run out, however, Cheeseman is already eligible for parole, with Hennessey not far behind in less than a year.

"They are caught, they are tried. They are found guilty and they are still trying to get out," said Keith Myrol, Brock Myrol's father.

The Supreme Court did not provide reasons for its decision Thursday.

With files from Sean Amato and the Canadian Press