Alison Lewis arrives at Swansea Crown Court

David Morris, 39, a scrap metal dealer from Craig Cefn Parc in the Swansea Valley, denies murdering Mrs Power, 34, her two children Katie 10, and Emily, eight, and their invalid grandmother Doris Dawson, who was 80.

The family had been bludgeoned to death with an iron pole, and fires were also lit around the house.

On Tuesday, Mrs Lewis had told Swansea Crown Court of her "enormous" distress when she heard about the murders from a neighbour.

Mrs Lewis began an intimate and passionate relationship with Mrs Powers, only two weeks after the couple met.

After her suicide bid, she was admitted to the Cefn Coed psychiatric hospital, and underwent 10 days of treatment.

David Morris denies four counts of murder

During this time, Mrs Lewis, who once played rugby for Wales, said she went "berserk" twice, and it took eight nursing staff to restrain her.

She also said she punched her fist through a closed window.

Mrs Lewis told Swansea Crown Court that the only way she could cope with the pain of the deaths was to do constant press-ups.

Mrs Lewis - and her police sergeant husband - were prime suspects in the murder hunt at one stage, but both were later released without charge.

'Massacre'

Earlier on Tuesday two witnesses told the murder trial they saw David Morris wearing a gold necklace similar to one found at the scene of the family massacre

The trial has already been told that Mr Morris admitted the necklace was "probably" his days before the case opened last month.

The trial, which is in its second week, has already heard that the family were beaten to death with an iron bar with Patrick Harrington QC, prosecuting, describe the deaths as a "massacre".

Details of Mrs Power's private life have also emerged - since her divorce, she had become something of a "sexual adventurer".

The trial at Swansea Crown Court is continuing - minus one of its panel of jurors who suffered a stroke at the weekend.