Two journalists then gave evidence based on their interviews with Davison about his book on this mother's death, Before We Say Goodbye.
Former Herald on Sunday reporter Nicola Shepheard gave evidence after being summonsed to do so.
She told the court she interviewed Davison about an original manuscript of his book, which she had received anonymously, and which featured passages not printed in the final book.
The passages referred to Davison preparing to give his mother what he calculated would be a lethal drink containing crushed morphine tablets. They said he held it up in front of her and told her if she drank it she would die.
Ms Shepheard told the court Davison verified the manuscript as authentic.
A recording of an interview with him was played in which he said one reason the passages were deleted was the possibility of legal action.
Another journalist, Mary Jane Boland, who was deputy editor of The Listener at the time, said she asked Davison what had been cut from the final version of the book and why.
He said although he was reluctant to leave certain passages out, he agreed to because there was a potential for prosecution.
The trial continues.
- Otago Daily Times