On Christmas Eve, 2008, Ms Ford was arrested after a drunken fight on Waiheke Island with her former partner, Steven Coutts. Police arrived at the house to find Mr Coutts with a bloodied face.
Detective Sergeant Andrew Townsend said he found Ford in bed. She told him "I don't know what happened".
She was arrested. While being processed at the police station, Ms Ford is alleged to have said: "I think I might kill him."
Another officer, Detective Sergeant Stephen Ambler, said he found a vacuum cleaner pipe with what appeared to be blood on it.
He said Mr Coutts described Ford's attack with the vacuum pole as "a stabbing like motion, as opposed to a baseball bat."
Ford was there when police interviewed the man and is alleged to have said "You are a f***ing nark, why don't you f*** up and die?"
Ms Ford is alleged to have waved a knife at a woman at the same house in a second incident.
She is alleged to have then slashed the woman's tyres.
Melanie Gillett told the court that in June 2009, a "pretty wasted" Ford threatened her with a knife and then slashed her tyres.
She said Ford was jealous of her relationship with Mr Coutts.
Mr Coutts had thrown Ford out of the house and she responded by calling to Ms Gillett to "come outside and have a fight, b****."
Ms Gillett said she was sitting at a table next to a window and could see Ford outside. She said she told Ford to go home and "smell the roses".
"She had her hand in the window and a few minutes after that, she had a knife."
She said Ford had the knife and was trying to "get in the window".
The police were called. Ford later pleaded guilty to possession of an offensive weapon and wilful damage.
Last week the court was told how locals heard screaming and yelling, moments before Ford is alleged to have killed Mr Marshall.
Simon Turner was helping his daughter deliver circulars in Orewa when he heard the raised voices.
He said he heard Ford yell: "F*** you, Gary, you piece of s*** loser. You broke my bottle of bourbon."
Mr Turner told the court that he stopped at a mailbox and saw a bag thrown out a window. Ms Ford came out of the house and was yelling abuse. She went and picked up the bag before going back inside.
Soon after a second bag landed on the lawn.
"There was a lot of abuse yelled at each other."
Then Mr Turner said he heard the sound of a slap. Mr Marshall had been standing on the verandah, facing the road and dressed in his underwear as Ford came out of the front door and slapped him.
"[Mr Marshall] turned around, grabbed the front of her clothing and punched her in the head. She stumbled back to the doorframe.
"He grabbed a handful of her hair and slammed her head into the doorframe at least three times."
He said Ms Ford fought back and raked her fingernails down his face.
He said Mr Marshall "manhandled" Ford inside before peering out of the house.
"I think he might have still been holding on to the woman."
Mr Turner said neighbours were in the area.
He said the argument continued inside the house but he could not see what was happening.
The next day he heard there had been a death in the street and contacted police.
A local, Markus Coops, has also told the court that he heard yelling and screaming.
A jury of six men and six women are hearing the case which is due to end later this week.
