Amber Heard's team will not call Johnny Depp to the stand, a source close to Ms Heard said, a strategic U-turn in the last days of the high-profile trial.
Ms Heard's team had planned to call Mr Depp for more questioning on Monday, but changed course without explanation at midday.
Mr Depp, 58, sued his ex-wife for $50m (£40m) for a column she wrote in which she claimed to be a victim of domestic abuse. Ms Heard, 36, has countersued.
The case is expected to wrap this week.
British supermodel Kate Moss, a former girlfriend of Mr Depp, is among witnesses expected to take the stand in the remaining days of the defamation trial.
On Monday, the court in Fairfax, Virginia, heard from several witnesses called by Ms Heard's team, including psychologist David Spiegel.
Dr Spiegel testified that Mr Depp "has behaviours that are consistent with someone that both has substance use disorder as well as behaviours of someone who is a perpetrator of intimate partner violence".
About 40-60% of intimate partner violence is committed under the influence of alcohol or substance use disorders, Dr Spiegel told jurors.
Mr Depp's lawyers sought to undermine this testimony on cross-examination, highlighting that Dr Spiegel had reached his conclusions without any direct contact with Mr Depp.
Also on Monday, a hand surgeon testified it was unlikely that Mr Depp's finger was cut during a fight with Ms Heard in Australia in the way that he has described.
Mr Depp has said the tip of his middle finger was severed when Ms Heard threw a vodka bottle at him.
The jury saw graphic images of Mr Depp's injured finger as Dr Richard Moore said that the damage was more consistent with being pinched by a closing door.
