Mobile phone traffic evidence has resumed in Graham Dwyer's trial for the murder of childcare worker Elaine O'Hara.
The Cork-born architect with an address at Kerrymount Close, Foxrock, denies stabbing her to death at Killakee mountain in Dublin in August 2012. Her skeletal remains were found in September 2013.
At the beginning of this trial, prosecution counsel Sean Guerin told the jury that his side would set out to prove there was mobile phone contact between childcare worker Elaine O'Hara and the accused Graham Dwyer.
He said they would hear that gardaí managed to extract data from Ms O'Hara's two phones, as well as from a Nokia phone found along with her keys and glasses in the Vartry reservoir in Wicklow in September 2013.
In that opening address he said that the content of the messages between the phones would show that they had an unusual sexual relationship that included acts of stabbing.
Five weeks on and the jury is now beginning to hear evidence of phone traffic to and from five mobiles of interest to gardaí carrying out the investigation including a prepaid 083 number bought on Grafton Street and an 087 number registered to A&D Wejchert.
Mobile phone operators like 02 and 3 Ireland supplied gardaí with records dating from 2011 to 2013.
Telecoms engineer Conor O'Callaghan also gave evidence explaining how mobile phone calls bounce off different cells according to location.