A legal expert told Fox News Digital that Cassie Ventura's mother Regina may prove to be a crucial witness in the federal case against Sean "Diddy" Combs.

Sean "Diddy" Combs' alleged abuse of former girlfriend Cassie Ventura Fine continues to be exposed in court as additional witnesses testify.

Combs threatened singer Cassie about the tapes via email, according to Cassie's mother, Regina Ventura, in her testimony Tuesday.

A former assistant to Sean “Diddy” Combs, Cassie Ventura’s mother and an exotic dancer nicknamed “The Punisher” all testified during Combs’ federal criminal trial on Tuesday as the prosecution continued to make its case against the hip-hop mogul.

Cassie Ventura’s mother, Combs’ former assistant and other witnesses offered revealing insights into Ventura’s relationship with Diddy–and what it was

Regina Ventura, mother to R&B singer Cassie Ventura, described screaming at Sean "Diddy" Combs after he took control of her daughter's cellphone.

Regina Ventura further testified that Sean Combs allegedly demanded $20,000 to “recoup money that he had spent" on Cassie.

Testifying in the federal sex trafficking trial of rap mogul Sean Combs, Cassie Ventura's mother described photographing bruises and cuts on her daughter's body to document his alleged abuse.

Cassie's mother, Regina Ventura, has testified that Diddy forced her to pay him $20,000 in exchange for her daughter's sextape. On Tuesday (May 20), Ventura took the stand in Diddy's federal racketeering and sex trafficking trial to testify against the Bad Boy Records founder,