According to the police report, Chris Brown's alleged fight with Rihanna began over a text message "from a woman who Brown had a previous sexual relationship with."

TMZ has now revealed the "mystery woman" whom they believe to have sent the text; Chris Brown's manager.

According to sources, Tina Davis, Brown's longtime manager, was rumored to have been in a sexual relationship with Brown back when he was 16, which may not have ended.

The text message mentioned "hooking up later," which upset Rihanna. She allegedly slapped Brown, and he responded by violently assaulting her.

Brown and Davis, who turns 40 this month, vehemently denied the relationship at the time. Davis has yet to comment on TMZ's claims.