<P> In the finale of Season 3 , she exposes Jax 's deal to the club thinking they would kill him . Her motivation for doing so seems to have been malicious . However , Jax was aware that she could not be trusted and had already informed the other members of the club . This led ultimately to Opie , with the help of Unser , targeting Agent Stahl in retribution for her role in the death of his wife , Donna . During this confrontation Stahl breaks down crying and begs Opie for her life , to which Opie responds , `` This is what she felt . '' He then shoots Stahl in the back of the head with a MAC - 10 , instantly killing her . After this , Chibs Telford rigs the scene to look as if the real IRA murdered Stahl and Jimmy O'Phelan . </P>
<P> In the finale of Season 3 , she exposes Jax 's deal to the club thinking they would kill him . Her motivation for doing so seems to have been malicious . However , Jax was aware that she could not be trusted and had already informed the other members of the club . This led ultimately to Opie , with the help of Unser , targeting Agent Stahl in retribution for her role in the death of his wife , Donna . During this confrontation Stahl breaks down crying and begs Opie for her life , to which Opie responds , `` This is what she felt . '' He then shoots Stahl in the back of the head with a MAC - 10 , instantly killing her . After this , Chibs Telford rigs the scene to look as if the real IRA murdered Stahl and Jimmy O'Phelan . </P>
who kills agent stahl on sons of anarchy
who kills agent stahl on sons of anarchy
Opie
Opie