Who is Joe Hill?
On Blue Bloods Season 11 Episode 15, shockwaves ripped through the family when it emerged that there was a new addition to the family.
But there was a surprising development when the family learned he was working undercover for the ATF.
Meanwhile, the rest of the family stepped in to help one of their own.
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.