Cassie Ventura, the prosecution’s star witness in the sex-trafficking case against Sean “Diddy” Combs, told jurors Tuesday how her relationship with the music mogul went from lovestruck to abusive. Ventura said that in the early years,

Sean “Diddy” Combs’s federal sex trafficking trial began Monday with opening statements and searing testimony from witnesses who detailed alleged violence, paid sex acts and coercion by the music mogu...

Prosecutors say Combs lured women into romantic relationships, forced them to take part in days of drug-fueled sex parties and then blackmailed them with videos he recorded of the encounters.