Jastine Valdez's murderer has not been linked to other serious crimes after a trawl of the national DNA database.
Mark Hennessy was shot and killed in south Dublin a day after he abducted and strangled the 24-year-old woman.
It is reported that no connection to any unsolved murders or sexual assaults has been produced despite a lengthy search of the database.
40-year-old Hennessy, from Dublin, was not known to gardaí for any serious criminal behaviour before the shocking murder in May.
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