Amber Heard told jurors on Monday that Johnny Depp allegedly slammed her against a wall and wrapped a shirt around her neck during their 2015 honeymoon on the Orient Express.
Heard returned to the witness stand in Virginia where jurors are considering duelling defamation claims by the former spouses.
The pair married in February 2015 and took their honeymoon on the Orient Express train in July of that year after Depp finished filming the fifth Pirates of the Caribbean movie.
Under questioning from her lawyers, Heard said the couple argued about whether Depp should drink during the trip. She said they had a loving relationship when Depp was sober but alleged that he often turned violent when drinking or using drugs.
In a sleeping car on the train, Heard alleged, Depp slapped her across the face and repeatedly slammed her body against a wall. He then took his shirt off and wrapped it around her neck, she alleged.
"That's how I woke up the next morning," Heard said. "I woke up with it still around my neck and a giant knot on the back of my head."
The first four weeks of the multi-million-dollar defamation case being heard by a seven-person jury in Fairfax in the US state of Virginia, have exposed the couple's volatile relationship in excruciating detail.
In her previous two days of testimony, a frequently tearful Heard accused Depp of becoming a physically abusive "monster" when he had been drinking and abusing drugs and of being obsessively jealous of her co-stars.
"He hated, hated James Franco," she said.
Depp, during his four days on the witness stand, denied ever striking Heard and alleged she was the one who was frequently violent.
During a particularly heated argument between the couple in Australia, an "irate" Heard severed the tip of one of his fingers by throwing a vodka bottle at him, Depp alleged.
Heard alleged that Depp sexually assaulted her with a bottle during the fight which occurred in March 2015, a month after their marriage.
He then used blood from his severed finger to write messages on walls and mirrors throughout the home where the couple had been staying during the filming of the fifth instalment of the Pirates of the Caribbean franchise, she claimed.
The 58-year-old Depp brought the suit against Heard over an op-ed she wrote for The Washington Post in December 2018 in which she described herself as a "public figure representing domestic abuse".
Heard, who had a starring role in Aquaman, did not name Depp in the op-ed, but he sued her for implying he was a domestic abuser and is seeking $50 million in damages.
The Texas-born Heard countersued, asking for $100 million and claiming she suffered "rampant physical violence and abuse" at his hands.
Judge Penney Azcarate has scheduled closing arguments in the case for 27 May, after which it will go to the jury.
Depp's lawyers have put experts on the stand who testified that he has lost millions because of the abuse accusations, including a $22.5-million payday for a sixth instalment of Pirates.
Depp filed the defamation complaint in the United States after losing a separate libel case in London in November 2020 that he brought against The Sun for calling him a "wife-beater".
Depp, a three-time Oscar nominee, and Heard met in 2009 on the set of The Rum Diary and were married in February 2015. Their divorce was finalised two years later.
Source: AFP and Reuters