The Dallas Cowboys retained offensive tackle Doug Free on a three-year, $15 million contract that includes $6 million in guaranteed money, a league source confirmed. Free is the Cowboys' right tackle. Free, 31, helped block for running back DeMarco Murray as he rushed for a league-high 1,845 yards. Free is a former Cowboys fourth-round draft pick. Follow me on Twitter: @RavensInsider Aaron Wilson covers the Ravens for The Baltimore Sun