A new trial has been ordered for two people found guilty of second-degree murder in a fatal attack on a man walking home with groceries in Calgary's Beltline.

Chantelle Campbell and Jarod Henry were found guilty of second-degree murder last year.

However, Crown lawyers have consented to both convictions being overturned and new trials have been ordered by Alberta's Court of Appeal.

"She's elated," said Campbell's lawyer Pawel Milczarek. "She's looking forward to presenting her side of the story to a jury."

Henry's lawyer David Chow said he believes the Crown consented because of an error in the trial judge's instructions to the jury before they began deliberations.

John Herrera Garcia, 49, was attacked in 2012. He had recently brought his family to Canada from Colombia, but died of his injuries several months after he was beaten.

During the trial, Henry and a third person charged — who was later acquitted — testified that Herrera Garcia may have kicked the parked car they were sitting in after they yelled an insult at him.

During a sentencing hearing, Campbell offered an apology, calling her actions "the worst mistake" of her life.

A second-degree murder conviction comes with an automatic life sentence with no chance of parole for at least 10 years.

For Campbell, the judge imposed a 14-year parole ineligibility and 12 years for Henry.