Graham Dwyer’s trial also heard that the phones had no other phone number saved in them, were used almost exclusively for contact with each other and were last used on the day the architect is alleged to have murdered Ms O’Hara.
The jury was hearing the evidence today on the 29th day of his murder trial at the Central Criminal Court.
Mr Dwyer (42) is charged with murdering the 36-year-old Dubliner at Killakee, Rathfarnham, Dublin on 22nd August 2012.
The Cork-born father of three of Kerrymount Close, Foxrock in Dublin has pleaded not guilty to murdering the childcare worker on that date.
Crime and policing analyst Sarah Skedd gave evidence about two Nokia phones found in Vartry Reservoir in 2013.
The court had already heard that these phones were purchased together at the O2 shop on Grafton Street on November 30th, 2011. They were unregistered.
Ms Skedd said that the first phone found had one number saved in it and that was for the second phone found. This was saved as MSTR on its sim.
“They’re obviously the consonants from the word, master,” suggested Seán Guerin SC, prosecuting.
“Yes,” she agreed.
There was also only one phone number saved in the sim of the other phone. This was the number of the first Nokia found and was saved as SLV.
She agreed with Mr Guerin that these were all of the consonants from the word, slave.
She explained that there were 1369 texts and 11 calls between the two phones between December 1st, 2011 and August 22nd, 2012, when contact stopped. The calls were all either unanswered or to voicemail.
She said that there were also five unanswered calls from Ms O’Hara’s own iPhone on the SLV phone. She agreed that this was consistent with a person owning two phones and using one to find another.
The trial has heard that Ms O’Hara was last seen in Shanganagh, South Dublin on the evening of August 22nd 2012, hours after she was discharged from a mental health hospital.
A cause of death could not be determined when her skeletal remains were discovered at Killakee on September 13th the following year.
It is the State’s case that Mr Dwyer stabbed her for his own sexual gratification.
The trial continues before Mr Justice Tony Hunt and the jury of five women and seven men.