Sean 'Diddy' Combs's explosive side was exposed by a friend of his ex-Cassie Ventura. Tiffany Red revealed all in an ABC News special.

A Special Edition of 20/20,” Tiffany Red remembered hearing the rapper scold his then-girlfriend over the phone.

Cassie’s songwriter Tiffany Red is recalling the first time something felt “wrong” in the singer’s romance with Sean “Diddy” Combs. Red, 37, told the story Wednesday, October 9, in Secret Life of Diddy — A Special Edition of 20/20 on ABC.

Cassie Ventura's songwriter claimed to have witnessed Sean "Diddy" Combs' explosive behavior a number of times, and said everyone was "afraid of him."

Cassie’s songwriter Tiffany Red recalled the first time she saw red flags in the singer’s relationship with Sean “Diddy” Combs. The New Jersey native, 37, appeared on ABC’s Secret Life of Diddy — A Special Edition of 20/20 on Wednesday,

Cassie Ventura's songwriter, Tiffany Red, isn’t holding back, claiming she heard Sean "Diddy" Combs cursing out his then-girlfriend. In ABC’s "Secret Life of Diddy - A Special Edition of 20/20," which aired on Wednesday,

Cassie Ventura's longtime friend, Tiffany Red, recalls alleged incidents with Diddy in 'Secret Life of Diddy: A Special Edition of 20/20,' streaming on Hulu. Red claims she heard the embattled media mogul berating Cassie over the phone in 2015.

The 37-year-old recalled the first time she felt something was “wrong” between the music mogul and his then girlfriend Casandra Ventura on ABC’s Secret Life of Diddy —

While Cassie hasn't spoken out about Sean 'Diddy' Combs' arrest, her songwriter seems to have something to say about the couple's time together. Tiffany Red has created a reputable career for herself collaborating with artists like Zendaya and Jennifer Hudson.