Barry Rogers told a jury today (Friday) he may have told people he had helped to kill his grandmother Betty Guy.

But he denied actually having anything to do with the death of the 84-year-old.

Rogers, of High Street, Fishguard, and his mother Penelope John, 50, of Union Terrace, St Dogmaels, deny murdering Mrs Guy at her home in Hillcroft, Johnston, in the early hours of November 7, 2011.

At first her death was put down to natural causes and her body was cremated at Narberth four days later.

Rogers this afternoon took the witness stand at Swansea crown court to tell the jury he had no recollection of telling various people that he had smothered Mrs Guy or threatening "to do the same to you" to one woman.

But he accepted he may have done.

"I did not play any part in her death and I don't remember making any of the comments. I may have said them but I can't remember.

"I have no recollection of making them.

"I do have a bad memory. I forget things, that's my only explanation.

"When I was younger I craved attention. I have grown up with that," he said.

Rogers said he had smoked cannabis on a daily basis at the time which could explain his poor memory.

"I absolutely did not suffocate my Nan."

Rogers said Mrs Guy had already died by the time he had driven to her home in Johnston from Frome in Somerset, where he had been living at the time.

"My mum opened the door. She was upset. She said 'you have just missed her.'

I understood that to mean she had just passed away.

"I believed I checked her pulse and I could hear my mother telephoning for the paramedics. I was devastated."

Rogers said Mrs Guy, who had been unwell, had never asked him to speed the end of her life.

The jury has heard how police secretly bugged John's home and tape recorded the couple talking about Mrs Guy's death almost immediately after they had been released on bail following their arrest on suspicion of murder.

They were re-interviewed about the comments that had been recorded.

Rogers told the police he had been aware of the listening device because after their release he had bought a bug detector on eBay.

According to the prosecution, the pair had been released in the early hours of the morning and Rogers had not had time to by a detector before the comments were made.

Rogers said he had since researched his eBay account and realised he had bought the detector almost a year earlier.

Rogers will be cross examined by Paul Lewis QC, who is leading the prosecution, on Monday.