Patriots notebook: Defensive end Rob Ninkovich expected in camp today, but to retire not to report for duty

FOXBORO — Eight years ago, Rob Ninkovich was barely even an afterthought when he joined the Patriots roster. This week, the 33-year-old has been the biggest storyline of camp. What a career. The defensive end has decided to retire, according to a source. The announcement is expected to happen this morning at Gillette Stadium after practice. One of the greatest underdog stories of the Bill Belichick era has come to a close. A fifth-round draft pick out of Purdue in 2006 by New Orleans, Ninkovich was released four times in his first four NFL seasons, including twice each by the Saints and Miami Dolphins. He also came back from a torn ACL early in his career, and the Saints eventually told him he’d