Sean “Diddy” Combs’ federal sex-trafficking trial commenced in New York. Cassie Ventura testified against the hip-hop mogul, and on Friday (May 16), Dawn Richard — who sued Combs for sexual abuse in September — testified against him as well.

The musician performed in two of the mogul’s best-known recent acts, Danity Kane and Diddy — Dirty Money. She sued him last year, alleging threats and groping.

The Danity Kane singer took the witness stand Friday and said she watched Combs "beat" his ex-girlfriend Casandra "Cassie" Ventura in 2009