05/01/2012 12:39 EDT | Updated 07/01/2012 05:12 EDT

Appeal launched after woman cleared of killing teen

The Crown is appealing the acquittal of Michelle Liard, who was cleared of the first-degree murder of a Brampton teen.

The 22-year-old was charged with murdering Aleksandra Firgan-Hewie, 13. Liard's former boyfriend Rafal LaSota admitted he stabbed the girl in his bedroom 37 times in December 2008.

The Crown alleged Liard helped plan the murder. LaSota is serving at least 25 years in prison after being found guilty of first-degree murder. But Liard was set free in early April after she was found not guilty.

The Crown filed its appeal of that verdict Tuesday morning.

LaSota admitted he repeatedly stabbed Firgan-Hewie, but his lawyers argued the killing was not pre-meditated.

Liard testified she didn't know LaSota was killing the teen in his bedroom because she was outside having a cigarette.

Firgan-Hewie's body was found in a garbage bag outside LaSota's home.