There's a major discovery on Tuesday night's new episode of NCIS: Los Angeles.

As Callen investigates the death of a Russian woman, he learns why he was targeted by a gunman months ago.

Watch the official CBS promo for "Pushback" below, followed a trio of images from the episode:

[video url="http://www.tvfanatic.com/videos/pushback-promo/" title="Pushback Promo"] [/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.