Paige's body was found on March 21 in a wooded area behind a path off Great Western Road, a busy route connecting Clydebank and Glasgow.
Shop owner Leathem was arrested three days later over the death - a killing which stunned the community and wider public.
In a statement released at the time, Paige's mother Pamela Munro said: "We are absolutely devastated that we have lost our beautiful little girl."
Days after her life was taken away, hundreds of people, many carrying pink balloons, turned out at a local park to remember the popular teenager.
The memorial event at Whitecrook Park was arranged by friends of the girl, who would now have been 16.