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.

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.

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

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

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

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

Cassie's mother, Regina Ventura, took the stand in Diddy's trial following Cassie's shocking claims of abuse last week

Regina Ventura, the mother of Sean Combs’ former girlfriend Cassie Ventura, testified she took pictures of bruises on her daughter’s body. NBC News’ Chloe Melas reports the jury also heard from Combs’ former assistant and an escort who said he participated in so-called "freak offs.

The second week of testimony in the sex trafficking trial of Sean "Diddy" Combs began on Monday. Tuesday's witnesses are expected to include an alleged escort known as "The Punisher," as well as Cassie Ventura's mother,