Sean "Diddy" Combs' ex-girlfriend Casandra Ventura, a rhythm and blues singer known as "Cassie," is expected to testify on Tuesday as the prosecution's star witness in the hip-hop mogul's sex trafficking case,

Sean "Diddy" Combs is standing trial on sex trafficking and racketeering charges in a case that has captured widespread attention.

The trial finished for the day, as scheduled, promptly at 5 p.m. The jury was warned not to speak to anyone about the case and was sent home.