Day 2 of the NFL's free agency frenzy began with another bunch of signings. Even Ray Lewis got a new deal - with ESPN. The biggest move Wednesday was made by Detroit, which agreed with Reggie Bush on a four-year deal to fill a huge hole at running back. The Lions haven't been able to count on 2010 first-round draft pick Jahvid Best, whose career is in doubt because of concussion issues. Bush adds to a strong offense led by record-setting All-Pro receiver Calvin Johnson. The second overall pick in 2006 by New Orleans, Bush rushed for 986 yards for Miami last season after gaining 1,086 yards in 2011, his first year with the Dolphins. Kansas City remained busy by adding cornerback Dunta Robinson, late of the Falcons, to the three free agents it signed the previous day when the marketplace opened. The Chiefs, who have the No. 1 pick in next month's draft after a 2-14 season, agreed to deals with tight end Anthony Fasano, defensive tackle Mike DeVito, and quarterback Chase Daniel on Tuesday, when they also finalized the trade with San Francisco for starting QB Alex Smith. After hiring Andy Reid as coach and John Dorsey as general manager, the Chiefs signed wide receiver Dwayne Bowe and punter Dustin Colquitt to long-term deals and franchised left tackle Branden Albert. Cleveland, another NFL also-ran, was just as active, agreeing to terms with linebacker Quentin Groves and tackle Desmond Bryant to further bolster a defense that added Ravens linebacker Paul Kruger hours after free agency began. "With the additions of Paul and Desmond, we believe that we have significantly improved our defense overall, particularly our front seven," Browns CEO Joe Banner said. Kruger is one of many Super Bowl winners to leave the Ravens, including hard-hitting safety Bernard Pollard, who was released Wednesday. The biggest loss for Baltimore was an expected departure: Lewis announced in early January that he was ending his 17-year career. Then he led the Ravens to the championship. On Wednesday, he joined ESPN as a studio analyst - an intense one, no doubt. "I'm ready to bring the same level of passion to this next phase of my life as I brought to the field during my years as a player," Lewis said. Baltimore signed defensive lineman Chris Canty, offensive lineman Ramon Harewood and running back Damien Berry. Also Wednesday: Chicago released tight end Kellen Davis after signing Martellus Bennett away from the Giants on Tuesday to replace him. The Giants signed 11-year veteran place kicker Josh Brown, who joins former Cowboys kicker David Buehler on the roster and apparently indicating free agent Lawrence Tynes won't be back. Tynes has made winning field goals in to NFC championship games in overtime and the Giants went on to win the Super Bowl in those seasons. Pittsburgh found its backup to QB Ben Roethlisberger in a Steel City native, Bruce Gradkowski. The 30-year-old Gradkowski is 6-14 as a starter with Oakland, Cleveland and Tampa Bay. He spent the 2011-12 seasons with the Cincinnati Bengals, appearing in five games. Pittsburgh also released oft-injured offensive lineman Willie Colon. Jacksonville released receiver Laurent Robinson, the latest high-priced player let go as part of the team's rebuilding project. Robinson signed a five-year, $32.5 million free agent-contract last season before missing considerable time with concussions. "It's unfortunate, but it's part of the business," Robinson said. Got to keep your head up and keep moving. Can't ever be surprised in this league. Tennessee agreed to terms on a multi-year deal with fullback Quinn Johnson, who has been one of Chris Johnson's lead blockers with the Titans. Buffalo addressed a need at linebacker by signing seven-year veteran Manny Lawson. The Bills are switching from a 4-3 alignment to a 3--4 under new coordinator Mike Pettine.