Johnny Depp was on a 24-hour cocaine and whiskey "bender" before going to the set of a Keith Richards documentary, Amber Heard told the High Court in London, as she finished giving evidence in her ex-husband's libel case against 'The Sun'.
The 'Aquaman' actress (34) said Mr Depp (57) refused to leave her house in March 2013 when he was supposed to be on the set of a documentary on The Rolling Stones' guitarist that he was directing until she admitted to having two affairs - both of which she denies.
Giving evidence at the Royal Courts of Justice in London, Ms Heard said she had been "so in love" with Mr Depp and had "always held out hope" that he would "get clean".
She said the 'Pirates Of The Caribbean' star was a "remarkable man" when he is "clean and sober", but said that "other side of him was a monster" in her fourth and final day in the witness box yesterday.
Ms Heard also said she met Mr Depp in July 2016, in breach of a domestic violence restraining order she had obtained, to try and resolve their divorce "in an amicable way" because she "didn't want to expose the totality of what really happened to me".
Mr Depp is suing 'The Sun's publisher, News Group Newspapers (NGN), and its executive editor Dan Wootton over an April 2018 article which labelled him a "wife beater".
Yesterday, Ms Heard was questioned about an incident in which the actress alleges Mr Depp hit her with the back of his hand, which caused her blood to hit the wall, after an argument about a painting by her ex-partner Tasya van Ree which was hanging in her house in Los Angeles.
In her first witness statement, Ms Heard said the incident took place on March 8, 2013, but she told the court she now considers the correct date of the "painting incident" to be March 22, 2013, when the couple and Ms Heard's sister, Whitney Henriquez, went to the set of the Keith Richards documentary.
Ms Heard said that, on that occasion, Mr Depp refused to leave her house and was "snorting lines of cocaine, drinking whiskey and he was saying we really need to work this out, he wanted to get to the bottom of it".
She added: "He had just gotten it in his mind that I had these affairs and he wouldn't leave until I admitted it."
Ms Heard told the court: "I was so in love with Johnny at that time.
"We had had a wonderful year together where he was sober and clean and that is how I got to know him.
"And Johnny, when he was like that, (is) generous, loving, he is a remarkable man when he is like that."
Ms Heard also gave evidence about an incident in Australia in March 2015, which she has previously described as a "three-day hostage situation".
Describing the scene of devastation she says she woke up to on the final day of the trip, Ms Heard told the court: "I started seeing all this blood on the carpet . . . which I thought was (from) my feet, but there was drops of it.
"There was blood everywhere."
Ms Heard told the court there were 'letters or messages, words' written on the walls in the 'brownish' substance. Mr Depp had burned holes through cushions, flipped a couch and set fire to one cushion, she said.
Ms Heard also said: "I found raw meat, at first I didn't know what it was, on the floor."
She said she did not want her allegations against Mr Depp to become public because "I didn't want to put Johnny (in a position) where the world or his kids would know fully what he was or what he could do".
Her sister Ms Henriquez gave evidence that she saw Mr Depp punch Ms Heard "really hard in the head ... multiple times" in Los Angeles in March 2015.
Ms Henriquez admitted that Ms Heard punched Mr Depp on that occasion, but only did so "in my defence".
She denied she had changed her evidence about the "painting incident" to "support and copy (her) sister" because the photograph of them on the Keith Richards set showed Ms Heard "with a clear face".
Ms Henriquez is due to finish her evidence this morning.
Mr Depp is suing over the publication of an article on April 27 2018 with the headline: "Gone Potty: How can JK Rowling be 'genuinely happy' casting wife beater Johnny Depp in the new Fantastic Beasts film?"
His lawyers say the article bore the meaning there was "overwhelming evidence" Mr Depp assaulted Ms Heard on a number of occasions and left her "in fear for her life".
NGN is defending the article as true, and says Mr Depp was "controlling and verbally and physically abusive towards Ms Heard, particularly when he was under the influence of alcohol and/or drugs".
The blockbuster case is due to finish next week with closing submissions from both sides' legal teams on Monday and Tuesday.