They are also convicted of attempted murder of the woman's partner.
The girl and the boy came from Jönköping and Märsta respectively and had, according to the prosecutor, not met before.
It was in December last year that a couple was shot in their apartment in Växjö. The woman was shot to death while the man was hit in the hand. The couple had no connection to crime. The reason for the murder is instead believed to be that they share a surname with a person with a criminal history. They are not related to the person.
Another boy in his 15s is convicted of instigating murder. A 29-year-old man is convicted of aiding murder.