What caused the car accident for Juliana Ramos on October 2, 2009? Does any of her friends know what happened?

I know it was at 3:30am on October 2, 2009. Did someone run a red light? Or drunk driver hit her? Or she was drinking? Does anybody know what exactly happened? Watched Chris Medinas story on AI tonight. Heartbreaking... I hope he goes all the way!