<P> Matt reveals to Caroline that he knows about her and that he was on vervain when he asked her to compel him . He also reveals her that her mother knows everything and she is trying to figure out what to do since she grew up hating vampires . While they talk, Tyler gets outside the house back to his human form and Caroline helps him . </P> <P> Alaric, Stefan and Elijah get to Bonnie and Jeremy (Steven R. McQueen) where Alaric tells Jeremy about Jenna and Stefan tells Bonnie that they will offer Klaus to take him and leave Jenna live . Stefan talks to Elijah before he goes to Klaus and asks him if he can trust him since Klaus is his brother and Stefan himself had many opportunities to kill Damon but he never did it because he could not . Elijah tells Stefan that he had other siblings too and Klaus took them away from him . Stefan realizes that Elijah wants revenge and he leaves . </P> <P> Damon gets mad when he learns about Stefan's decision and along with Jeremy, Bonnie and John (David Anders) try to find a way to safe Jenna and Elena from becoming a vampire . Stefan arrives at the place where the ritual takes place and talks with Klaus about his offer . Jenna tries to use her vampire power to hear what Stefan and Klaus are talking about and she hears that Stefan wants to take her place . Klaus though does not accept Stefan's offer and Greta continues with the ritual . Jenna tries to kill Greta but Klaus stops her and kills her . </P> <P> Bonnie leaves with Damon to go to Klaus trapping Jeremy and Alaric in the cave to keep them safe . Before they go, Bonnie also casts a spell to John to make sure that Elena will not come back as a vampire . Klaus completes the ritual by drinking Elena's blood and the moment the transition starts, Bonnie comes and attacks him while Damon kills Greta and takes Elena's body away . While Klaus is down, Elijah comes to kill him but the last moment, Klaus tells him that the bodies of their family are safe and if he kills him he will never know where they are . That makes Elijah changes his mind and he spares Klaus' life . </P>

When does aunt jenna die in vampire diaries
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