Jastine Valdez's murderer has not been linked to other serious crimes after a trawl of the national DNA database.
According to The Herald, Gardai have spent weeks combing the DNA database to see if Mark Hennessy is linked to any unsolved murders or sexual assaults.
The paper reports a lenghty comb of the database has failed to produce any connection.
The 40 year old from Ballybrack was not known to Gardai for any serious criminal behaviour before he abducted and killed 24 year old Jastine Valdez near Enniskerry in May.
Her body was found days later off Pucks Castle Lane after Hennessy was shot dead in a confrontation with Gardai in Cherrywood.
Last week Jastine's parents led mourners at the funeral for the Tallaght IT student in her native Philippines.