The highly anticipated trial of hip-hop mogul Sean "Diddy" Combs is underway.

Prosecutors are aiming to fill in the picture of the mogul’s relationship with Casandra Ventura by questioning his former assistant and Ms. Ventura’s mother.

Gannon is set to be followed by Dr. Dawn Hughes — a sexual trauma psychologist who previously testified at R. Kelly's sex trafficking trial and at Harvey Weinstein's trial — and George Kaplan, who wa...