A newly-released court document reveals disturbing details about the vicious attack and sexual assault of a 62-year-old Edmonton woman last January.

A 17-year-old male pleaded guilty in September to aggravated sexual assault and robbery, but details of the case weren't available until Thursday when a youth court judge granted a joint request by the CBC and Edmonton Journal to release the agreed statement of facts.

According to the court document, the woman was walking home around 9:45 on that January evening after getting off the bus in downtown Edmonton. The temperature was –12C, with a windchill of –18C.

A male approached and started attacking her without warning. He brutally raped and beat the Edmonton grandmother, and left her partially clothed on the frozen sidewalk.

When a neighbour found the victim more than an hour and a half later, she was semi-conscious and suffering from hypothermia.

Security footage from a nearby building showed the blood-covered teen carrying the woman's purse. A witness later encountered the youth and asked him if he was OK.

"Oh don't worry," the teen reportedly said. "It's not my blood. I just finished fighting for my life."

The victim was kept in hospital on life support for days and suffered permanent brain damage. She is now back at home but a family member recently told CBC News that she is afraid to go outside.  

The teen is undergoing a psychiatric assessment and will be sentenced in December. He cannot be identified under the Youth Criminal Justice Act.

The Crown will be asking to have the teen sentenced as an adult.