Enligt CNN...
The protests turned violent Wednesday night after Grant's funeral and following an announcement by authorities that Officer Johannes Mehserle, who is implicated in the shooting, had turned in his resignation.
....
District Attorney Tom Orloff told CNN on Wednesday the incident is a "pretty clear" homicide, and his office will focus primarily on Mehserle's mental state before the shooting.
http://edition.cnn.com/2009/CRIME/01/08/BART.shooting/index.html