15 August 2012 Last updated at 09:38 ET

The man accused of murdering a Perthshire pensioner was "gobsmacked" to learn a partial profile of his DNA was found on her wrist, a court heard.

The jury was read parts of William Kean's police interviews which took place in March, the month after 80-year-old Jenny Methven was found dead.

Mr Kean, 46, denies killing Mrs Methven at her Forteviot home on 20 February.

He has lodged a special defence blaming the victim's son David Methven, or others connected to him.

The High Court in Glasgow heard Mr Kean told police during the interview that he did not assault Mrs Methven.

Det Sgt Brian Smith had told the accused he was offering him a chance to explain what had happened.

Mr Kean denied murdering Mrs Methven but replied "no comment" when asked if he had been in her house and then refused to explain that answer.

He also told officers that if he knew who was involved in her murder, he would tell them.

Mr Kean had said to officers: "I wish I did. I wish someone would come forward and admit it. It's a sad time for everybody."

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DNA evidence 'gobsmacked' accused