As bad as the last week has been, Chris Brown hasn't seen the half of it.
The R&B star is being investigated for a variety of felonies, including domestic violence, assault resulting in great bodily injury and - based on specific allegations made by Rihanna - even attempted murder, an E! Online source says.
But as they build their case, the source says, prosecutors fear that making any serious felony charges against him stick could prove difficult in a case in which there are no direct witnesses other than Chris Brown and Rihanna herself.
He's accused of beating his longtime girlfriend in the early morning of February 8, causing them both to cancel scheduled Grammy performances that night.
Rihanna told cops that, as the two fought in his rented Lamborghini, Brown said to his girlfriend, "I'm going to kill you," in addition to choking and beating her.
The Barbados-born songstress, who is reportedly cooperating with the investigation, also told authorities that Brown choked her until she lost consciousness.
Brown was booked by police on suspicion of making criminal threats, but the D.A. wanted further investigation into the attack before formally pressing charges.