[treetopsandroofs]

This article says a suspect has been arrested.

http://twitchy.com/2015/07/22/shot-in-the-back-hayward-calif-police-officer-killed-during-traffic-stop-suspect-arrested-bluelivesmatter/

[Robert DeLong]

Acting Police Chief Mark Koller says they have one person of interest in custody, but no arrest has been made. Koller went on to say that Hayward PD is not looking for any another suspects in this case and that are there are no threats to the community at this time.