Rob Gronkowski announces retirement from the NFL, again - Pats Pulpit
Gronk Announces Retirement From NFL: 'Time to Move Forward' - TheWrap
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Patriots Suffer Big Loss: Gronkowski Will Retire - The New York Times
Rob Gronkowski retires: Bucs TE to end his Hall of Fame NFL career
Patriots' Rob Gronkowski announces retirement from football
Patriots TE Rob Gronkowski announces retirement
Rob Gronkowski Announces Retirement From The NFL – Hollywood Life