Brian Dawkins says his head told him to retire, not his neck. The veteran safety called Denver Broncos coach John Fox on Monday morning to tell him that after plenty of prayer and reflection, he'd decided that 16 seasons in the NFL was enough. Then, Dawkins announced his retirement on Twitter, where he quickly began trending as fans worldwide expressed their admiration for the mild-mannered family man who transformed himself into a ferocious football player on Sundays.