A woman is expected to take the stand at Sean Combs’s federal trial on Wednesday to give her account of the music mogul dangling her over a 17th-floor apartment balcony.

Bryana Bongolan, a friend of Casandra Ventura, Mr. Combs’s former girlfriend, filed a lawsuit against Mr. Combs last year. In her complaint, Ms. Bongolan said she had been staying in Ms. Ventura’s Los Angeles apartment when, early one morning in 2016, Mr. Combs stormed in, yelled at Ms. Bongolan and held her over the balcony railing — “with only Combs’ grip keeping her from falling to her death” — before he pulled her back and slammed her onto a patio table.

Her full account has been anticipated for months. The indictment that charges Mr. Combs with sex trafficking and racketeering conspiracy made brief mention of what appears to be Ms. Bongolan’s account, saying that “on one occasion, Combs dangled a female victim over an apartment balcony.” Her story was also referenced in Ms. Ventura’s bombshell civil suit in November 2023, which led to the government’s investigation and Mr. Combs’s arrest.

The racketeering charge against Mr. Combs involves accusations that the mogul engaged an inner circle of bodyguards and high-ranking employees to help him commit a series of crimes over two decades.

Mr. Combs has pleaded not guilty to the charges. His lawyers have said that he and his employees were involved in legitimate business operations, not a criminal conspiracy, and that the sex at issue in the government’s case was entirely consensual.

Prosecutors, nearing the halfway point of what they expect to be an eight-week trial, said they will soon call “Jane,” the second woman — after Ms. Ventura — who the government says was a victim of sex trafficking by Mr. Combs.