CHRIS BROWN threatened to kill RIHANNA in between a series of brutal punches and bites after she desperately tried to contact her assistant to come to her aid.
According to the police report filed after the attack Brown also tried to throttle the singer and told her he was going to beat her even more once he got her home.
In the statement, officers described a call from a "screaming woman," who was "very upset and crying".
Rihanna told cops the pair had an argument earlier in the evening in February at a pre-Grammy awards bash, and it continued as they made their way home in Brown's car.
After the Umbrella star "became enraged and slammed both of her fists against the dashboard", Brown pulled the car over and tried to push her out. He then began punching the star, before driving away while continuing to beat his lover with his right hand as he steered with his left.
The report claims Brown stopped the attack after Rihanna looked in the mirror to check her face for swelling - but told her, "(I'm) going to beat the s**t out of you when we get home! You wait and see!"
Rihanna then made a desperate attempt to call her personal assistant on her cell phone, enraging Brown even further as she pretended to tell the employee to contact police. Brown told the star, "You just did the stupidest thing ever! Now I'm really going to kill you!"
Another series of blows followed, forcing Rihanna to cover her head with her arms. She tried to flee, but Brown stepped on the gas and the car door automatically shut. He grabbed her in a headlock, bit her left ear, and put such pressure on the singer's throat, she nearly passed out through lack of oxygen.
The brutal attack only ended when Rihanna tried to break the window of the car with her shoe. Brown delivered a series of final blows before storming out of the car as Rihanna removed the keys from the ignition.
Brown was sentenced to five years probation and ordered to stay at least 100 yards away from his ex-girlfriend for the same amount of time by a Los Angeles judge on Tuesday following his plea deal with prosecutors in June.
He will also have to report for hard community labour duties in the next 72 hours, which he will have to undertake in his native Virginia for six months.
Following the sentencing, which also saw Brown ordered to pay almost $6,000 in expenses and fines, court officials released a blow-by-blow account of the vicious attack, taken by a police officer at the scene.