Okay, so we knew Ray J rear-ended Kim Kardashian in their infamous sex tape.

What we did not know until now is that Ray's sister, Brandy, rear-ended another car at 65 mph and caused a motorist's death.

TMZ has learned that Brandy, the R&B sensation, was involved in the fatal accident last month, and it appears to be her fault. It happened on December 30 on the 405 Freeway in Los Angeles.

Law enforcement sources tell TMZ that Brandy was cruising in her 2007 Land Rover at 65 mph and did not notice that the cars in front of her had slowed considerably. Brandy's vehicle struck a 2005 Toyota, which then hit a 1989 Toyota. The 2005 Toyota slid sideways and hit the center divider. As it came to a halt, it was struck by a 1988 Acura.

The driver of the 2005 Toyota was taken to Holy Cross Hospital in critical condition and died. Brandy, who joins Prison Break's Lane Garrison in the club of troubled stars responsible for fatal accidents over the past few months, was not injured and the driver of the Acura suffered moderate injuries. Janice Dickinson was also rammed recently, but that was in a different car crash, don't worry.

Poor Moesha. :(

Brandy was not placed under arrest and there was no evidence drugs or alcohol involved. Which is good, because as Nicole Richie has shown us recently, popping Vicodin and puffing the chronic to treat menstrual cramps doesn't result in good vehicular safety.