On Monday, Laura Szendrei's family and friends sobbed as a Crown lawyer read details of how the killer repeatedly hit the 15-year-old girl over the head at a park in September 2010.
The man, who was 17 at the time, was charged but not convicted for the other attacks in nearby Burns Bog.
Szendrei was assaulted in broad daylight as a crowd was gathered for a sporting event close to the area where she was walking in the park.
Her friend responded to her screams and discovered she'd been beaten.
Szendrei died in hospital the next day. (CKNW)