4-time champion, All-Pro tight end Rob Gronkowski announces
Rob Gronkowski Announces His Retirement - Sports Illustrated
Rob Gronkowski announces his NFL retirement
Patriots Suffer Big Loss: Gronkowski Will Retire - The New York Times
Rob Gronkowski announces his retirement
Rob Gronkowski announces retirement from NFL for second time
Former Arizona Wildcat Rob Gronkowski retires from NFL for second
Rob Gronkowski announces second retirement from football
Tom Brady Has Perfect Response to Rob Gronkowski's Retirement
Patriots' Rob Gronkowski announces his retirement following nine
Rob Gronkowski Intends To Retire
Rob Gronkowski Retired. Again. - The New York Times
Can Tom Brady Lure Rob Gronkowski Out of Retirement for a 2nd Time