The government’s star witness wept, telling jurors that the rap mogul’s “freak offs” made her feel “worthless, just like dirt.”

Casandra Ventura, the singer known professionally as Cassie, ended four days of sometimes grueling testimony about being abused by Mr. Combs.

The cross-examination of Cassie Ventura ended midday Friday as her time on the stand neared its conclusion in Sean “Diddy” Combs’ racketeering and sex-trafficking trial.