One thing the Crown and the defence agree on is that the death of Mr Guy was not an accident or manslaughter but was murder - that whoever fired the shotgun blasts at him intended for him to die.
Kylee Guy told of the last day she spent with her husband and how she never thought the police cars at the end of her driveway were for him.
She'd been woken about 6.30am by their son Hunter, who came into the bedroom with his toy trains.
They heard motorbikes and Hunter thought it was his father coming home.
"Hunter heard motorbikes and then he said, 'Dad' ... Every morning he ran down to meet Scott," Mrs Guy said through tears.
They went to the window and saw police cars and a large truck.
Her first thought was not for her husband but for farm worker Matthew Ireland, who she feared may have been hit by the truck.
"I thought something had happened to Matthew, I thought he might have been hit. I didn't think it was Scott."
But she could also see Scott's truck, and started to worry. She also noticed the gates to the driveway were locked, which she said was unusual and was done only when stock were being moved.
Gathering up Hunter, she walked out of the house, but was stopped by a police officer.
"I went outside and started walking ... It was light and I could clearly see the light. I could see someone running ... He raised his arms up and told me to stop.
"I said, 'What happened?' and he said, 'Go back inside the house'."
Inside, she rang a friend for help and also her mother, telling her all she knew at that point: "Something's happened to Scott."
Her father-in-law, Bryan Guy, arrived to break the news. He found her sitting on the bed crying and they eventually had to walk across a paddock to leave the house because the driveway had become a crime scene.
They went immediately to the home of Anna and Ewen Macdonald.
During her evidence, Mrs Guy smiled when speaking about her husband, whom she met at a rodeo in Hawkes Bay.
Macdonald's lawyer, Greg King, asked Mrs Guy if she recalled her husband making a 111 call on Sunday, July 4. She said it was because a suspicious vehicle had been seen in the area.
Mrs Guy told the court a trip her husband took with Macdonald to Invercargill was positive for future plans. Scott had told her "it was really good to get to know Ewen" and that he had "opened up".
Anna Macdonald looked briefly towards her husband before she sat down to give her evidence, but he kept his head down, as he has done through most of the trial.
She was at home getting herself and four children ready for the day when her sister, Nikki Guy, banged on the door.
She came inside saying, "It's Scott, It's Scott, he's dead, he's been shot."
"She was pretty spaced out ... [She just said] Scott had been shot and didn't go into anything else."
Within minutes, Ewen Macdonald came "jogging" into the washhouse.
"He was really pale and shaking and had been crying."
He asked her if she was okay.
"I asked what was going on. I thought someone must have got it wrong."
Mrs Macdonald said she didn't remember what time her husband got up on the morning of the shooting.
The Crown alleges Macdonald shot Mr Guy at his Aorangi Rd home within minutes of 4.43am before cycling back to the farm to milk the cows by about 5am.
Ms Macdonald said her husband had been getting up about 4.50am "for some time".
She had got up about 6.15am when woken by her four children.
This week's evidence has focused on the morning of the murder, and Mrs Guy and Mrs Macdonald will return to court at later stages.
The next group of Crown witnesses will focus on the relationship between the defendant and the murder victim.
