The former fifth-round draft pick has started all 48 games in three seasons with the Chiefs, making 207 tackles and four picks while pairing with Brandon Flowers to create a shutdown defensive backfield.
The Chiefs had placed a first-round tender on Carr.
Third-round draft pick Justin Houston agreed to a $2.78 million, four-year contract with the Chiefs, a person familiar with the deal told The Associated Press.
The person spoke on condition of anonymity Wednesday because the team had not made an official announcement. The deal includes a $671,000 signing bonus.
Houston, a defensive end, was the 70th overall pick out of Georgia and among the last rookies to sign.
The team also announced the signing of free agent safety Sabby Piscitelli.
Raiders' McFadden out two weeks with broken bone in face
The Raiders were hoping to have the bulk of their team on the practice field for the first time but were missing McFadden and 14 other players with various injuries.
McFadden left practice early Wednesday with the injury. He delivered a hard block on linebacker Quentin Groves in one drill, but Jackson did not say if that caused the injury.
McFadden led the team with 1,157 rushing yards and 10 touchdowns last season.
Avril signs free agent tender to stay with Lions
Cliff Avril welcomed a son Wednesday night and returned to work less than 24 hours later.
The Detroit Lions' defensive end signed a one-year qualifying offer Thursday morning and joined the rest of the team's free agents on the practice field for the first time. The restricted free agent could be in for quite a haul by the end of the season.
"This is a big year for Cliff," coach Jim Schwartz said of Avril, whose deal is worth about $3 million. "He's always been productive when he's been on the field but as far as being healthy and playing 16 games, it's a big thing for him.
"His speed-rush ability, his athletic ability, it's very important to us."
The four-year veteran had a career-best 8½ sacks last season while starting all 13 games he played.
49ers add free agent safety Whitner
Whitner had said on Twitter earlier Thursday that he was going to join the Cincinnati Bengals.
Chargers sign top pick Liuget
"We're very happy that Corey's contract is done. It's time to go to work," Chargers general manager A.J. Smith said Thursday, according to the team.
The Chargers are hoping Liuget, who is listed at 6-foot-2 and 300 pounds, will compete for a starting position at defensive end.
Liuget was second-team All Big Ten as a junior, when he was credited for 4.5 sacks and 12.5 tackles for a loss.
Saints sign DB Oliver, source says, and cut RB Hamilton
Oliver has played the past three seasons for the San Diego Chargers. He had one interception, one forced fumble and two fumble recoveries last season.
The Saints also signed former Chicago and Arizona cornerback Trumaine McBride.
New Orleans had to make some cuts to keep their training camp roster at 90. Five of the players released were rookie free agents and one was running back Lynell Hamilton, who had been with the club since 2008 but missed last season because of torn right knee ligaments.
Report: Jets will not re-sign Ihedigbo
The Jets will not re-sign free agent safety James Ihedigbo, a person familiar with the situation told the Associated Press, meaning the hard-hitting special teams ace will be playing elsewhere this season.
Ihedigbo has been with the Jets since 2007, when they signed him as an undrafted free agent out of UMass. He was a key contributor as a backup in Rex Ryan's secondary, setting a career high with three sacks last season, and was second on the Jets with 27 special teams tackles.
It was believed the Jets wanted Ihedigbo back, especially since the safety position appeared thin when free agency began. He also tweeted to fans recently saying he wanted to return. But New York then re-signed Eric Smith and Brodney Pool, and added free agent DaJuan Morgan to bolster the safety spot, which includes Jim Leonhard and Emanuel Cook.
Sources: Amukamara signs with Giants
The cornerback, selected 19th overall out of Nebraska, was the last of the first-round picks to sign. With a new rookie salary system in the new CBA, Amukamara, who played at Nebraska, would get $8.1809 million under a max deal from the Giants, although teams are allowed to pay slightly more if they wish.
Ravens add Pollard to help secondary
The move was announced Thursday.
Pollard has played five NFL seasons, the last two with Houston. Last season he led the Texans with 111 tackles and four forced fumbles.
Pollard broke into the league with Kansas City after being selected by the Chiefs in the second round of the 2006 draft. He has played in 76 career games, starting 59, and has totaled 402 tackles, seven interceptions and forced eight fumbles.
Seahawks re-sign DE Brock
Brock had a career year with Seattle in 2010. After being released by the Tennessee Titans a year ago, Brock signed with Seattle and had the highest sack total of his nine-year career, with nine. Brock teamed with defensive end Chris Clemons to net 20 sacks as the duo became one of the most productive in the league in getting pressure on quarterbacks.
Brock is the Seahawks' sixth free-agent signing along the defensive line in the past week.
Titans agree with veteran CB Walker
The Titans announced the deal Thursday when they placed Mouton on injured reserve. Mouton injured his right Achilles tendon Tuesday night and had surgery Thursday.
ESPN.com previously reported that Babineaux was staying in Seattle.
Bills sign free agent WR Davis
Davis has 51 catches for 558 yards and two touchdowns since entering the NFL as a first-round pick in 2007.
The Bills also waived cornerback Domonic Cook.
Source: Panthers agree to deal with WR Naanee
Naanee played four seasons for the Chargers after getting drafted out of Boise State in 2007. He caught 63 passes for 736 yards and three touchdowns for San Diego, which declined to offer him a contract.
Redskins re-sign Doughty, Golston McIntosh
The Washington Redskins re-signed safety Reed Doughty, defensive tackle Kedric Golston and linebacker Rocky McIntosh, the team announced Thursday. All three players were unrestricted free agents who have spent the previous five years of their careers with the Redskins. Terms of the deals were not disclosed.
Dolphins sign rookie Kia, re-sign four others
Kia is a rookie free agent out of UCLA.
Murtha started four games for the Dolphins last season.
Eagles DE Abiamiri could miss season
Abiamiri was hurt at practice Tuesday.
Abiamiri, an honorable mention All-American at Notre Dame, was taken in the second round of the 2007 draft, but injuries limited him to just 29 games in his first four seasons. He missed all of last season with a knee injury that required offseason microfracture surgery.
He has four regular-season sacks in four years, plus one in the 2008 NFC championship game.
The Eagles' defensive line has struggled with injuries in the first week of training camp. Defensive tackle Mike Patterson is out indefinitely after suffering a seizure on Wednesday and defensive tackles Trevor Laws (hip flexor) and Antonio Dixon (knee sprain) are both out of practice.
Information from The Associated Press was used in this report.