Convicted murderer Colin Howell has denied he controlled his former lover Hazel Stewart, even though he drugged her.
Mr Howell confirmed he had drugged his lover to have sex. He agreed with Mr Ramsey it was a form of control, but said she was a willing participant.
He told the court he gave her laughing gas (gas and air) eight to 10 times after the murders and perhaps did so before as well, but could not be sure.
Ms Stewart has denied any involvement in the double murder of her husband Trevor Buchanan and Howell’s wife Lesley in 1991. Howell is serving a life sentence for the two murders.
Howell told the jury at Coleraine Crown Court: 'Hazel and I were waltzing together, in time. All the side-stepping was done together. I was not dragging her around the floor.
'I may have been the lead partner in that dance, but she was doing it in perfect harmony and willingly.'
The jury also heard claims by the dentist that he was overwhelmed by guilt during police interviews following his arrest by detectives in January 2009.
He said he would have agreed to anything, including the murder of US president John F Kennedy and the shooting of the fictional JR Ewing.
He said: 'I would have admitted to them because of my mental state of mind and my emotions at the time.'
Howell told Mr Justice Hart that he and Ms Stewart held a dark secret because of the killings.
He had control of the information, which made him manipulative and deceitful, but he did not believe he was a controlling person.
The former dentist said he had never believed he controlled women in his life.
He said there was legitimate control and illegitimate control. He had the right to have legitimate control over his children.
In his evidence today, Howell denied being a psychopath and claimed anyone could potentially have done what he did.
A specialist psychiatrist who examined the father of 11 in prison after he confessed to poisoning his wife and Mr Buchanan concluded he was psychotic.
Howell rejected the assessment of Helen Harbinson and other medical experts about his mental state.
He claimed they examined him when he was experiencing a mental breakdown in Maghaberry Prison after his arrest in 2009.
'I don't agree with the conclusion of Helen Harbinson or any of the other psychiatrists,' he said.
'I believe any human being has potential to do what I did, but I did it - that's what sets me apart from most of humanity.
'I am very intelligent, but I completely lost my marbles after being arrested. My mental heath deteriorated very rapidly, but I am in a much better situation now.'
