bay area that the killing apparently was not a random act. joining me now from los angeles is nbc news correspondent niala charles. welcome, and i'm curious what we expect to learn from this press conference, and do we know yet why the supervisor believes the killing may have been targeted >> yeah, we're hoping to learn more about that in the press conference that is expected to start shortly here about more specifics about the suspect. we do know that suspect was arrested early this morning, and again, that's according to the city's board of supervisors president who says that this was not a targeted attack. it's been, of course, more than a week since bob lee was stabbed in san francisco around 2:30 a.m. since then we know police have been asking the public to come forward with surveillance footage saying that it's important in the case, and also we know that since then the daily mail.com has surveillance footage moments after lee was stabbed. in it he appears to try to flag down a car but that car does not stop he tries to flag that car, i