The Central Criminal Court has heard that murder accused Graham Dwyer drew detectives a map that led Gardaí to find a hunting knife and a flick knife in the architect's firm where he worked.
The 42-year-old of Kerrymount Close, Foxrock, denies murdering childcare worker Elaine O'Hara at Killakee mountain in Dublin on August 22, 2012, in what is alleged to have been a sexually motivated stabbing.
The jury has heard that in February 2014, several months after Graham Dwyer's arrest, a hand-drawn map was faxed from his solicitor to detectives investigating the murder of Elaine O'Hara.
Detective Sergeant Peter Woods said the fax in Mr Dwyer's handwriting, was titled "items of interest", and showed a plan of the filing area in the basement of the architect's firm A&D Wejchert.
He said the hunting knife was considered "hugely significant" by gardaí, as it had been ordered online and delivered to Graham Dwyer's workplace on the day before Elaine O’Hara went missing.
He said the black handled hunting knife was "very clean" but that the scabbard had "a number of small scratches on the leather".
Described as a buck special – there was evidence it had been ordered online from activehuntingireland.ie with a request that the package be marked private and confidential.