'Painstaking and meticulous' investigation nailed killer
It was a "painstaking" case involving officers from three separate jurisdictions who spent "many thousands of hours" investigating Elaine O'Hara's murder.
Senior garda officers spoke about the investigation after architect Graham Dwyer was found guilty of murdering Ms O'Hara.
Supt John Hand from Blackrock Garda Station, who was one of the senior members of the force involved in the investigation, outlined the vast amount of evidence and work that went into securing a guilty conviction against Dwyer.
He described how a core team of 20 gardai assisted by a wide range of officers with varying individual skills were "meticulous" in conducting the investigation.
"Some 619 separate lines of inquiry were pursued, in this jurisdiction and in the US and the UK, and 511 separate reports were written. A total of 488 people were interviewed and 788 statements obtained.
"In excess of 5,300 hours of CCTV footage were scrutinised by members of the investigation team, and a total of 2,620 text messages were retrieved and analysed," Supt Hand said.
Chief Supt Diarmuid O'Sullivan, who heads the eastern division of the Dublin Metropolitan Region, expressed his sympathy to the O'Hara family in coming to terms with Ms O'Hara's death.
"I wish to acknowledge at this most difficult time Frank O'Hara and his family," Chief Supt O'Sullivan added.
"I hope that the family gains some comfort in knowing that no effort was spared by the investigation team."
He also described how the "diligent work" of Gda James O'Donoghue was a key part in piecing together a "varied and complex" case.
Det Supt Kevin Dolan also acknowledged the important work carried out by specialist units including "the computer crime unit, the Telecom Communication Section and the Garda Analysis Service".