Former New England Patriot Rob Ninkovich reveals he retired to avoid 'another 850 shots to the head'
Patriots' Rob Ninkovich Announces Retirement - LAFB Network
11 things we learned from Rob Ninkovich's retirement news conference - The Boston Globe
Rob Ninkovich, Patriots Team Captain, Announces Surprise Retirement
Patriots' Rob Ninkovich retires after 11 seasons in NFL
Patriots LB Rob Ninkovich Announces His Retirement
Patriots LB Rob Ninkovich Announces His Retirement
Rob Ninkovich retirement: New England Patriots players, coaches pack the room for unique press conference