Huge Arrow season 3 spoilers was leaked online recently and if the reports and rumors are to be believed then Oliver Queen would encounter the biggest shock of his life.

Users over at Reddit and 4Chan have been theorizing on answering the question "Who killed Sara Lance?" and it seems that the answer was revealed when alleged leaked information was spread on 4Chan.

An anonymous user claiming to be one of the production assistants of the show has confirmed that Thea was the one who killed Sara Lance at the first episode of Arrow season 3.

The user claimed that they are shooting the scenes right now where Oliver Queen finds out that Thea killed Sara.

It remains to be seen if Thea really did kill Sara, but judging from her training and time spent with Malcolm Merlyn, Thea could very well be hiding something dark hidden inside her.

In other news, new behind the scenes and official still photos were released by The CW regarding the upcoming episode "Draw Back Your Bow".

What did you think about these potential Arrow season 3 spoilers? Sound off in the comments section below and tell us, Who killed Sara Lance?