. >> reporter: lining up all that evidence can take a while, says kpix 5 legal analyst judge ladoris cordell. the d.a. has to be able to prove the case beyond a reasonable doubt. >> right now, i don't think people should be too concerned but as time goes on, i would say if it gets to six months or more i think we should all be asking questions about why nothing has happened. >> reporter: so now there's another wrinkle we have learned about. investigators have had some trouble tracking petrov down to talk to him. he is struggling with mental illness and has head injuries. the alameda county district attorney has decided not to pursue any charges against him. no charges there. but what about for the deputies? no specific date. but my sources tell me look for a decision, quote, very soon. reporting live in the newsroom, i'm joe vazquez, kpix 5. >>> new at 6:00 santa clara needs a new mayor and we're hearing who the lead candidate is and for the 49ers she might be tougher than any opponent they have faced on a field. kpix 5's devin fehely in santa clara with the big changes that could be on the