Movie star Johnny Depp has told London’s High Court that his ex-wife Amber Heard or her friend had defecated in their bed in what he described as a “fitting end to the relationship”.

Giving evidence in his libel action against Britain’s Sun newspaper, which labelled him a wife-beater, Depp has faced four days of cross-examination over allegations from Heard that he physically attacked on at least 14 occasions during a three-year period from 2013.

The court was told on Friday that one such incident followed a party to celebrate Heard’s 30th birthday party in April 2016, the Sun‘s lawyer Sasha Wass said.

The Pirates of the Caribbean star was late because he had been at a meeting with his business manager, where he had received bad news about his finances.

At their home, Depp was accused of attacking Heard when she criticised him for being late, throwing a magnum bottle of champagne at her, which missed, and grabbing her hair.

The following day, the cleaner found faeces in their bed, something Ms Wass said Depp had said in text messages he thought hilarious.

“It was one of the most absurd statements that I have ever witnessed in my life,” Depp said.

“I was convinced it was Miss Heard herself or one of her cohort involved in leaving human faeces on the bed.

“It thought it was a strangely, oddly fitting end to the relationship.”

When the couple next met up in May when Depp went to collect some possessions from their home, a row erupted over the faeces incident, which Heard blamed on one of their dogs.

Depp denied he had been spoiling for a fight and said Heard had brought up the issue, telling the estate manager in a phone call it was a “harmless prank”.

In an ensuing argument, Depp was accused of throwing his phone at his ex-wife, striking her on the cheek, an accusation he rejected.

Days later, Heard sought a restraining order against Depp and the court was shown pictures of Heard with a bruise on the cheek.

Depp said the accusation wife-beater meant he had gone from “Cinderella to Quasimodo in 0.6 seconds”.

Amber Heard has accused her ex-husband of violence. Photo: Getty

The court heard he sent a text to his business manager in August 2016 in which he called Heard a “50 cent stripper” who was “begging for total global humiliation”.

“I have no mercy, no fear and not an ounce of emotion, or what I once thought was love for this gold digging, low level, dime a dozen, mushy, pointless dangling overused flappy fish market,” the text, read by Ms Wass, said.

Depp has been accused of attacking his ex-wife, whom he met in 2011 and married four years later, during violent, angry, jealous rages when he was drunk or had taken large amounts of drugs.

According to Ms Wass, Depp had an alter ego, which both he and Heard referred to as “the monster”, whom he turned into after heavy drinking or drug-taking.

Depp has rejected all the allegations and says Heard is lying, telling the court she physically assaulted him, forcing him to often flee to bathrooms to hide from the confrontation.

He says the claims are a hoax and part of a dossier she had been collecting as “an insurance policy”.

Heard, who has also been in court for Depp’s appearances in the witness box, is due to give evidence next week as is Depp’s former long-term partner Vanessa Paradis and his ex-girlfriend, actress Winona Ryder.

-AAP