Katerina Petrova ruined many peoples lives and April Cerolice is one of those people.

When Stefan and Damon were turned, they no longer had feelings for Katerina as she was not their mate so when April comes along and lures the brothers in with her natural beauty, it was no surprise that Katerina was jealous and made her life hell...even going as far as killing her and blaming it on someone else but, as the brothers blood ran in her system she had a whole new life ahead of her.

Katerina decided against killing her as a vampire and instead told her that the loves of her life were dead, sending her into a spiral of depression and bloodthirst for decades.

Megan Fox as April Cerolice

Paul Wesley as Stefan Salvatore

Ian Somerhalder as Damon Salvatore

Disclaimer
Part of the storyline is my own but of course I dont own The Vampire Diaries.