Much of the testimony was hard to watch. Combs’ ex-girlfriend, Cassie, recounted being beaten and pressured into degrading sexual performances with strangers.

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

The singer, prosecutors' star witness, took the stand in Sean “Diddy” Combs’ trial on Tuesday to testify about their former relationship and his alleged freak-offs.