Brian McConnachie QC lodged a special defence on his client's behalf
claiming the crime was committed by a woman.
Prosecutors allege the boy was armed with a knife when he took Alesha from her bed at a house in Ardbeg Road in Rothesay, Bute.
It is claimed the boy then carried the schoolgirl to the site of the former Kyles Hydropathic Hotel on the island.
The indictment states he took off Alesha's clothes, shook her violently before placing his hands over her nose, mouth and around her neck.
Boy accused of Alesha murder blames woman