Shocking new evidence about what happened in the car the night Chris Brown allegedly beat Rihanna.
TMZ has obtained LAPD detectives notes from a search warrant in the case. According to the notes, Rihanna read a three-page text message on Brown's phone from a woman. An argument ensued and Brown allegedly tried forcing Rihanna out of the car but couldn't because she was wearing her seat belt.
Brown then allegedly shoved Rihanna's head against the passenger window. When Rihanna turned to face him, Brown punched her, then continued punching her while driving, according to the detective's notes.
Blood spattered all over Rihanna's clothing and in the interior of the car. Her mouth was filled with blood.
Brown allegedly told Rihanna, "I'm going to beat the **** out of you when we get home. You wait and see."
Rihanna called her assistant and left a message saying, "I am on my way home. Make sure the cops are there when I get there."
Brown then replied, "You just did the stupidest thing ever. I'm going to kill you."
According to the report, Brown continued to punch Rihanna, bit her on her ear, her fingers and put her in a headlock -- she almost lost consciousness.