The deal to send a pass rusher to San Francisco was finalized, while two starters from the Philadelphia Eagles' first Super Bowl-winning team were placed on the reserve/retired list, with a contender losing a key piece to its O-line.

Darby signed a one-year deal with Houston in March, but came to the conclusion it was in his best interest to retire. The 31-year-old cornerback is the second notable retirement this week, as Detroit Lions center Frank Ragnow announced his decision to step away from football on Monday.