Grammy award-winning rapper Kid Cudi is expected to testify in the federal trial against Sean “Diddy” Combs on Thursday in what could prove to be a pivotal moment for prosecutors.

Combs faces five criminal counts in total, including two of sex trafficking. He denies all the allegations.

Regina Ventura, the mother of Sean Combs’ former girlfriend Cassie Ventura, testified she took pictures of bruises on her daughter’s body.