<P> Stahl proved to be trustworthy in her deal with Jax when she is able to push back SAMCRO's bail hearing by 10 days so that the bikers can go to Belfast to get Abel back . She supplied a rigged testimony for Gemma to relay to the U.S. Attorney's office, incriminating Agent Tyler in the process . She has been trustworthy because she knows that Jax's knowledge of the California gun - running operation can save her dying career and unlike the rest of her deals she had a lot to lose by breaking . </P> <P> It is reinforced in season three that Agent Stahl is bisexual as she is shown to be having an intimate relationship with Agent Tyler, the one she incriminated in the statement she gave to Gemma . During an assignment, Stahl shoots Agent Tyler in the throat and sets it up as a drive - by from a Mexican gang . In her statement, she admits their intimate relationship and claims that Agent Tyler had confessed to framing Gemma for the murder of Edmond, thereby exonerating Gemma and holding up her end of the deal . When Gemma finds out about the deal, she threatens to revoke her statement and tell the authorities who really wrote it . Stahl replies that she is already too late, as she has already been exonerated . </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