Dude — that was one of the ...

Question: Dude — that was one of the best AA columns ever last week. You are truly a god among columnists. Now enough with the flattery! Spill on Veronica Mars!Answer: Dude — that was one of the most accurate coolest e-mails ever. Now, more about Mars: The central mystery of the season will be a whodunit after all, with the ill-fated character biting it in the Sept. 28 premiere. (No, that's not a typo. The Mars premiere has been pushed back a week.) Meanwhile, here's some casting scoop: Producers have tapped newcomer Tessa Thompson to play Veronica's new African-American pal Jackie Cook (also not a typo; it's been changed from Jackie Chase).  And Krysten Ritter has been cast as the daughter of S