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    "Pretty Little Liars" Fatal Finale: Who Dunnit?

    All we know is this bitch is blonde. [SPOILERS AHEAD.]

    During its summer finale, Pretty Little Liars shocked fans by offing one of the show's main characters, Mona Vanderwaal.

    Within minutes, #RIPMona was trending on Twitter.

    We only know one thing about Mona's killer: she (he, it) has blonde hair.

    That blonde hair could belong to Alison DiLaurentis...

    Or the mysterious Cece Drake.

    Hanna Marin might have been wearing extensions.

    Perhaps this shady character from season one, episode nine did it.

    But maybe it was someone wearing a wig. Like Ezra Fitz...

    Or Byron Montgomery...

    Noel Khan...

    Lieutenant Tanner...

    Or Mona's Boyfriend, Mike Montgomery.

    But there's really only one person who could be capable of such a heartless crime...

    Serena Van der Woodsen.

    She never got credit for being Gossip Girl, so maybe ... She is A.

    Okay maybe not. Only two things are clear: Mona will be missed...

    And next season can't come soon enough.