Last week's episode, surprisingly, did not have much on Nate's death, instead focusing on Cooper. This week's episode, "Cop Or Not," does, however, using Sammy's first day back as a springboard. Sammy must be questioning himself as a cop, knowing he could have shot the people who were attacking them, and he spends most of the episode in reflection when not chasing down gang members.
The main plot follows a Hollywood star who is probably a killer. With paparazzi swarming, the situation gets out of hand and the star shoots himself. Only afterwards does more evidence show up, pointing to someone else.
Is it correct to assume it was Russell who sold the photos? After all, he had motive and means, but would he betray Lydia like that?