Watch Hawaii Five-0 Online: Season 9 Episode 9

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Who killed Adam's sister?

That was finally revealed on Hawaii Five-0 Season 9 Episode 9 when the officer realized a lead that had not been followed up and set out to avenge the death of his loved one. 

Meanwhile, a renowned urban vigilante was murdered after making a citizen's arrested and the team had to enter the world of superheroes and comic books to locate the killer. 

Who suited up?

Use the video above to watch Hawaii Five-0 online right here via TV Fanatic. 

Catch up on all your favorite shows and reviews and join in the conversations with other fanatics who love TV as much as you.

Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.

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Hawaii Five-0 Season 9 Episode 9 Quotes

Jerry: You ever wish you were a superhero?
Grover: Walter Payton.
Jerry: He wasn't a superhero.
Grover: I saw him play. Superhuman.

I don't know what those [emojis] mean. Can you help me, millennials?

Danny [to Tani and Junior]