'Pretty Little Liars' fans in deep mourning after major character kill-off

Spoiler alert!

Twitter is littered with sad faces and #RIPMona.

Hot ABC Family show Pretty Little Liars wrapped up its season with the murder of a major character. Gasp!

Mona Vanderwaal, played by series regular Janel Parrish, was about to spill all she knew when she was approached from behind by someone with long hair wearing a black hoodie. Next thing we know blood is everywhere. And Mona's lifeless body is in a trunk.

But, remember, this is TV! She may be back. Parrish tweeted:

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