The deal, which runs through 2024, includes a $20 million signing bonus, a source told ESPN.
Martin skipped organized team activities without the security of the long-term contract but will join his Cowboy teammates for mandatory minicamp this week.
The contract averages $14 million per year, making Martin the second-highest-paid offensive lineman in the NFL behind tackle Nate Solder of the New York Giants, according to the NFL Network.
--Oakland Raiders coach Jon Gruden would like to see a quick resolution to the contract dispute involving star defensive end Khalil Mack.
Mack was absent from the team's first day of mandatory minicamp on Tuesday as he seeks a lucrative contract extension, per multiple media outlets.
A three-time Pro Bowl selection and 2016 NFL Defensive Player of the Year, Mack is set to make $13.846 million this season in the fifth-year option of his rookie contract. The 27-year-old reportedly is looking to become among the highest-paid non-quarterbacks in the league.
--Andrea Kremer has been named recipient of the 2018 Pete Rozelle Radio-Television Award, which is presented annually by the Pro Football Hall of Fame in Canton, Ohio.
Kremer, who is a chief correspondent for the NFL Network, is second woman to win the award, joining Lesley Visser of CBS, who was honored in 2006.
With Charean Williams of Pro Football Talk announced as the winner of the McCann Award on Tuesday, women will receive both major media awards presented by the Hall of Fame for the first time.
--Free agent running back Terrance West signed with the New Orleans Saints after working out for the team, according to multiple media reports.
West is expected to receive playing time immediately with Mark Ingram under suspension for the first four games of the regular season for violating the NFL's policy on performance-enhancing substances.
The Saints added West to a group of backs that includes Alvin Kamara, Jonathan Williams, Trey Edmunds, Daniel Lasco and Boston Scott.
The 5-foot-10, 225-pound West has 1,816 yards rushing and 11 touchdowns on 465 attempts in his NFL career, averaging 3.9 yards per carry. He also has 51 receptions for 344 yards receiving.
--Baltimore Ravens cornerback Jimmy Smith participated in practice, approximately six months removed from tearing his left Achilles tendon.
Smith sustained the injury while attempting to cover a deep route during the Ravens' 44-20 victory over the Detroit Lions on Dec. 3.
The 29-year-old participated in individual drills during a mandatory minicamp practice and hopes to be ready for the regular-season opener on Sept. 9.
--Former Indianapolis Colts general manager Ryan Grigson is joining the Seattle Seahawks in an undisclosed front-office role, his agent announced.
Grigson served as a senior personnel executive with the Cleveland Browns last season before being dismissed after John Dorsey replaced Sashi Brown as the team's general manager.
The 46-year-old Grigson, who replaced Pro Football Hall of Famer Bill Polian in 2012, was fired from the Colts in January 2017.
--Former Denver Broncos linebacker DeMarcus Ware will be hired as a pass-rush consultant for the team, multiple media outlets reported.
Ware will work "a few days a week, a few times a month" to help Denver's pass rushers, ESPN's Adam Schefter reported, citing a source.
The nine-time Pro Bowl selection and four-time first-team All-Pro recorded an NFL eighth-best 138 1/2 sacks with the Dallas Cowboys and Broncos before retiring in March 2017.
Ware's career-high 20 sacks with Dallas in 2008 are the fifth-most recorded in a single season in NFL history. The 35-year-old Ware, who is the Cowboys' all-time sacks leader with 117, played the final three seasons of his 12-year NFL career with the Broncos.
--New York Giants defensive tackle Damon Harrison is champing at the bit to hit his own teammate.
Harrison isn't mad at Saquon Barkley. The All-Pro just wants to give the rookie running back a welcome-to-the-NFL moment.
Contact is not permitted until training camp, however.
"You get in between the lines, you get the ball in your hands, I don't give a damn what anybody says. It's time to work," the 6-foot-3, 350-pound Harrison said, via the New York Post. "I don't think we'll be able to hit him too hard, but I'm gonna hit his (expletive)."
--Tom Brady is spending time away from the voluntary portion of the New England Patriots' offseason activities to work on his game. His golf game, that is.
Brady played a round of golf on Tuesday with Phil Mickelson and Rickie Fowler as well as investment banker Jimmy Dunne, according to Tim Rosaforte of the Golf Channel. The quartet played at Friar's Head Golf Club in New York.
--Washington Redskins defensive end Stacy McGee has been sidelined the last three weeks after undergoing groin surgery, coach Jay Gruden said, according to the Washington Times.
McGee missed the team's mandatory minicamp and sat out the last two weeks of the voluntary organized team activities.
Gruden did not say how McGee was injured, when the surgery occurred or how long he will be sidelined.
McGee, 28, played in all 16 games last season and made 10 starts. He recorded 44 tackles and is expected to play a prominent role this coming season.
--San Francisco 49ers wide receiver Marquise Goodwin was named winner of the 2018 George Halas Award, The Pro Football Writers of America announced.
The award is presented to an NFL player, coach or staff member who overcomes the most adversity to succeed.
Goodwin notably played through personal anguish last season, as his infant son died from pregnancy complications. Hours later, Goodwin caught an 83-yard touchdown pass against the New York Giants and broke down in the end zone with his teammates by his side.
Five weeks later, his father died before a game against the Tennessee Titans. Goodwin reeled in a career-high 10 receptions for 114 yards in that contest.
--Cleveland Browns wide receiver Jarvis Landry said that he hasn't heard from quarterback Ryan Tannehill since being traded from the Miami Dolphins.
Furthermore, Landry said he isn't the least bit shocked by the silence.
Landry recorded 288 of his 400 career receptions from the hand of Tannehill during his first three seasons in Miami. The three-time Pro Bowl selection reeled in a career-best 112 catches last season for 987 receiving yards and nine touchdowns while the quarterback was sidelined because of a knee injury.
Landry signed a five-year, $75 million contract extension with the Browns after he was acquired in a trade with the Dolphins.
--Linebacker Fred Warner, a third-round pick of the San Francisco 49ers out of BYU, signed a four-year contract, the team announced.
The 6-3, 236-pound Warner played in 49 games (42 starts) in four years at BYU and registered 264 tackles, 32 tackles for losses, 6.5 sacks, seven interceptions (two for touchdowns), five fumble recoveries, three forced fumbles and 13 passes defensed.
Warner, who was a team captain as a senior, played in all 13 games during each of his last three seasons with the Cougars and his seven career interceptions rank second in school history among linebackers.
--Quarterback Christian Hackenberg, a former No. 2 draft choice of the New York Jets, passed through waivers unclaimed one day after he was cut by the Oakland Raiders, the NFL Network reported.
Hackenberg, who was selected with the 51st pick of the 2016 draft by the Jets out of Penn State, has yet to throw a pass in his two-year NFL career.
The Jets traded Hackenberg to the Raiders three weeks ago after selecting USC quarterback Sam Darnold with the No. 3 overall pick.
With Josh McCown and Teddy Bridgewater also in the on the roster, the Jets sent Hackenberg to Oakland for a conditional seventh-round pick.