Rob Gronkowski: NFL tight end announces retirement
Rob Gronkowski: Yeah, I threatened to retire if the Patriots traded me to the Lions
Rob Gronkowski retirement keeps Patriots' tight end door spinning
Rob Gronkowski hosting retirement party at Mohegan Sun next month
Rob Gronkowski announces retirement - NBC Sports
Why Now: What Got Rob Gronkowski Out of Retirement
Rob Gronkowski confirms he threatened to retire over trade talk: 'Brady's my quarterback'
How Tampa Bay got Rob Gronkowski back in the NFL - Good Morning America
Here's to hoping that Rob Gronkowski's retirement is brief
Rob Gronkowski retires: New England Patriots tight end calls it a career on Instagram