"Sons of Anarchy" season 7 episode 4 will be airing tonight on FX.

The fourth episode is titled "Poor Little Lambs" and the synopsis is as follows: "A past effort to help one ally leads to trouble with another."

Jax is slowly inching closer to the truth after three intense episodes of the show's final season.

Prior to the season 7 premiere of "Sons of Anarchy," there were rumors that major characters would be killed off in each episode. No one has been killed off yet, but tonight's episode could be the start as Jax continues his revenge for the death of his wife.

The sneak peek trailer for "Poor Little Lambs" shows a gunfight between Jax, Bobby, Chibs and another gunman.

Another scene shows Jax and Gemma. "Juice is around," Jax tells his mother. She looks unfazed, but fans know that she's probably trembling inside already, as Jax is coming closer to knowing the truth about Tara's death.

What will happen to Gemma once Jax finds out the truth? Nero is seen in the trailer talking to Gemma, saying, "It ain't about revenge anymore. He's doing it because...it just feels good."

Will someone die in tonight's episode? There are speculations that it could be Juice or Unser.

Be sure to watch the fourth episode of "Sons of Anarchy" season 7 on FX tonight. The episode will also be available to watch online via live stream here .