A garda investigating the disappearance of Bobby Ryan made a note saying: "Mary Lowry had his head melted," but he could not remember who made the comment, the Central Criminal Court has heard.
Chief Superintendent Dominic Hayes told defence counsel Lorcan Staines SC that the comment emerged during a conference of gardai involved in the investigation when Mr Ryan was still a missing person.
He made a note of it but does not remember who said it.
Mr Ryan (52), a part-time DJ going by the name 'Mr Moonlight', went missing on June 3, 2011, after leaving his girlfriend Mary Lowry's house at 6.30am.
His body was found in April 2013 in a run-off tank on the farm owned by Ms Lowry (52) and leased by Patrick Quirke (50), of Breanshamore, Co Tipperary.
The prosecution claims that Mr Quirke murdered Mr Ryan so he could rekindle an affair with Ms Lowry.
Mr Quirke has pleaded not guilty to Mr Ryan's murder.
On his second day of cross-examination, Chief Supt Hayes also revealed that Mr Ryan's phone last pinged off a mast at 10.19am on the day he went missing.
The mast is at Crogue Motors on the Cashel Road but he explained this does not mean the phone was immediately beside that location and agreed with Mr Staines that a phone at Fawnagowan could ping off that mast.
Mr Staines also pointed the witness toward an entry in his notebook dated February 23, 2016, which read, "height-bumper".
Mr Staines asked him what that meant. The witness said it could have related to vehicles in the yard at Fawnagowan, a tractor or a van, adding: "I can't put it any further."
Mr Staines asked him what gardai had been discussing and he said he did not recall.
Ms Justice Eileen Creedon told the jury that the prosecution case will come to a close on Monday.