Since the actor Jonathan Majors was found guilty in December of assaulting and harassing a girlfriend, he has maintained his innocence and his hope of reviving a once-skyrocketing career that disintegrated in the wake of his conviction. In a televised interview last month, he said that he had “never struck a woman.”

But in pretrial statements to the prosecution in that assault case and, separately, in interviews with The New York Times, another former girlfriend, Emma Duncan, accused him of emotionally and physically abusing her — choking her, throwing her around and bruising her. A third, Maura Hooper, also said that he had emotionally abused her.

Speaking publicly for the first time, Ms. Duncan and Ms. Hooper, actresses who dated Mr. Majors before he shot to fame as the supervillain Kang in Marvel projects, described him as a controlling, threatening figure who isolated them from friends and career pursuits. “You lose your sense of worth,” Ms. Duncan said.

And in interviews with former colleagues, The Times found that Mr. Majors had a history of volatility on the set of the HBO series “Lovecraft Country” that included confrontations with female co-workers that led them to complain to the network.

On Thursday afternoon, a lawyer for Mr. Majors, Priya Chaudhry, said that Mr. Majors had not physically abused Ms. Duncan. She described the relationships with both women as “toxic” and said that Mr. Majors was taking responsibility for his role in them. She added that “countless” women in the entertainment industry “can attest to his professionalism.”

This article is based on interviews with 20 people, including some who requested anonymity for fear of career repercussions, and on statements submitted to the prosecution in the December case, in which Mr. Majors was found guilty of harassment and misdemeanor assault of Grace Jabbari, a former girlfriend. He is scheduled to be sentenced in April, though his lawyers asked on Tuesday that the judge throw out the jury’s guilty verdict.