A witness in the Tipperary murder trial has told the Central Criminal Court that murder accused Pat Quirke seemed unperturbed after the body of Bobby Ryan was found on her farm in April 2013.

Mary Lowry was giving evidence for a second day in the trial of Patrick Quirke of Breanshamore, Co Tipperary.

Mr Quirke has pleaded not guilty to the murder of Bobby Ryan at an unknown location on a date between 3 June 2011 and 30 April 2013.

Ms Lowry said she became aware that something very serious had happened on her farm when she saw garda vehicles and scenes of crime tape on 30 April 2013.

She went to the yard and saw Mr Quirke and his wife Imelda. While she did not make eye contact, she felt Mrs Quirke was "shook by it", but felt Mr Quirke was "not perturbed at all".

She learned that the body had been found in a disused run off tank on the farm. She did not know about the existence of the tank until then.

Ms Lowry said she left her home that day and never returned.

The prosecution alleges that Mr Quirke killed Mr Ryan because they were love rivals.

It says he later staged the discovery of the body because his lease was coming to an end and he would have to hand over control of the farm.

He denies the charge.

Earlier, Ms Lowry described how she ended the farm lease agreement after seeing on CCTV Mr Quirke walking around her house and looking in windows.

She also claimed he had taken her underwear from her washing line.

Ms Lowry said her house alarm had gone off 17 times in less than two years, prompting her to install CCTV cameras.

On 3 December 2012, her alarm went off when she was away for the day. She later viewed CCTV footage on which Mr Quirke could be seen walking around her house and looking in windows.

He could also be seen near a shed that contained a clothes line and her post box. Ms Lowry said she had mixed clothing on the line, but also her underwear.

Ms Lowry said she reported the matter to gardaí, but did not make a formal complaint. She then instructed her solicitor to write to Mr Quirke ending their lease agreement allowing him to use her farm.

"I just wanted the lease to finish. I just wanted to be rid of this man who was walking around my house taking things and upsetting me," she said.

She said it was agreed he would leave the farm in July 2013.

In April 2013, she had an encounter with him on the farm when she told him "you're some c***. I can't wait to see the back of you and I hope you won't be stealing Mary Dillon's knickers off the line."

Ms Lowry told the jury this was a reference to the woman he had arranged to rent land from and to what he had taken from her (Ms Lowry's) clothes line.

The jury also heard more detail about a letter alleged to have been written by Mr Quirke to a Sunday newspaper agony aunt outlining the end of his affair with Ms Lowry.

The prosecution read the entire letter to the jury.

Ms Lowry confirmed this was the letter she had read in the paper which yesterday she said she "immediately recognised" as having been written by Mr Quirke.

The letter to agony aunt Patricia Redlich in February 2011 read to the jury said:

"I've made a right mess of my life and I need help on how to go forward. It all started four years ago, when my best friend died. This man was also my wife's cousin and a close family friend. He left a wife and a young family after him.

"I coped by throwing myself into doing all I could for my friend's wife and children. There was much sorting out to do in relation to his business. Unfortunately, this led to an affair with his wife, and I fell deeply in love with her.

"It lasted three years and came to an abrupt end recently when I found out that she was seeing someone else. When I confronted her, she claimed that she had fallen out of love with me and was waiting for an opportunity to end 'us'.

"This was a defining moment for both of us. She no longer depended on me, and quickly forgot about me by putting all her energy into developing this new relationship. This man promised everything that I couldn't. She introduced him to everyone in the family, including my wife, and they were all delighted that she had found love again.

"My problem is that I am broken hearted and angry at how well things have worked out for her, despite her lying and cheating on me. We meet on a constant basis as we have a business connection as well as the family connection. She refuses to discuss our affair and says it is in the past. She has confessed it to her new lover, while I have no closure and am forced to carry this dark secret alone. I now feel a tremendous amount of grief, and shame, for a lost love -- and am possibly suffering postponed grief for a dead friend -- all in silence.

"I know I have done wrong and let my wife down badly. I contemplated telling her, but feel it would do nothing to relieve my burden while it would devastate her.

"I have been diagnosed with depression, but none of the medication is working. My wife has been a tremendous support and loves me deeply. Ironically, this almost makes things worse.

"Unfortunately, while I love her, I am not in love with her. I'm still in love with my ex-lover even though I accept that the affair is over. I wish I wasn't, and wish I could transfer the feelings I have for her back to my wife. How do I begin to rebuild my life?"

During cross-examination Ms Lowry denied that she had learned off parts of her statements made to gardaí.

The jury was told she made more than 20 statements to gardaí and had been given copies of them.

Defence Counsel Bernard Condon suggested she was concerned about her reputation. She said she was, and that her whole life was being discussed in the courtroom.

Mr Condon said she was not allowed to make speeches and said it was a feature of her evidence that she sought at every opportunity to portray herself in the best light possible and Patrick Quirke in the worst light possible.

Mr Condon said: "You've tried to put the boot in on all occasions."

Ms Lowry replied: "Excuse me, I have not. I have told the truth from the very word go, that man manipulated me."

Mr Condon said: "I'm not interested in your hatred you are here to deal with the facts, not to settle scores."

"I have said that from the time my husband died Pat Quirke manipulated me."

Mr Condon suggested that instead of taking responsibility "you have attempted to divert attention and vitriol".

She also denied that her late husband Martin had been good friends with Patrick Quirke. She said they were acquaintances in the same line of business but were not friends. She disagreed with a statement from man who will give evidence who described them as "great friends".

Asked if she had told the whole truth to the gardaí in her statements she said she had not at first told them about the affair with the accused because she was ashamed.

Asked about an inconsistency in her evidence yesterday she said she was very nervous when she began giving her evidence yesterday and wasn't sure what she said.