The update was reported by NFL Network’s Tom Pelissero on Thursday, after Quinn had interviewed for head coach roles with the Arizona Cardinals, Indianapolis Colts and Denver Broncos this offseason.
The Cowboys' defense has been transformed under Quinn the past two seasons, ranking seventh in scoring in 2021 (21.1 points allowed per game) and fifth this season (20.1).
Quinn was named the Assistant Coach of the Year by the Associated Press in 2021.
Addressing the positive news for the franchise, head coach Mike McCarthy expressed his relief in retaining one of his most valuable assistant's.
"We're all extremely excited to have Dan back," he said. "I spoke with Dan a short while ago, and this is big for us.
"It gives us continuity, definitely in what we established these last two years, to build off of that. And frankly, on a personal note, I can't tell you how thankful I am."
The Cowboys head into the offseason looking to improve on a promising – but ultimately disappointing – 2022 campaign. After a 12-5 regular season record, Dallas handled the Tampa Bay Buccaneers in the Wild Card round but lost 19-12 to the San Francisco 49ers in the Divisional Round on Sunday.
Meanwhile, offensive coordinator Kellen Moore continues to be interviewed for head coaching jobs.
Despite keeping Quinn and head coach Mike McCarthy in place, the Cowboys’ coaching staff will have several new faces in 2023 after the club chose not to renew the contracts of six assistants.
Among the coaches not returning next season are assistant head coach Rob Davis and senior defensive assistant George Edwards, along with offensive line coach and former Miami Dolphins head man Joe Philbin.
Edwards and Quinn have been given most of the credit for developing two-time All-Pro pass rusher Micah Parsons.
A journeyman defensive line coach from 2003-2012, Quinn rose to prominence as the coordinator of the Seattle Seahawks’ defenses in 2013-14, led by the "Legion of Boom" secondary.
The Seahawks made back-to-back Super Bowl appearances in those two seasons and secured one title.
Quinn left Seattle to be the head coach of the Atlanta Falcons, a job he held for six seasons with a 43-42 record and one Super Bowl appearance.
There have been nationwide protests in the United States after Floyd – an African-American man – died in police custody in Minneapolis on May 25.
A police officer was filmed kneeling on Floyd's neck during an arrest after he was crying out for help as he was handcuffed and pinned to the ground.
Quinn took part in the march to the governor's mansion in Atlanta amid efforts to eradicate racial injustice, and he was joined by Falcons general manager Thomas Dimitroff.
Assistant coaches Bernie Parmalee and Doug Mallory were also involved, as well as players like Ricardo Allen, LaRoy Reynolds, Tyeler Davison and Mykal Walker.
"What I've learned about leadership is that it is about other people, and we have to hold ourselves accountable to help those around us," Quinn said via ESPN. "That's what I wanted to do today."
Dimitroff added: "I've always believed we are all created equal and should be treated as such but have passively held back my voice. I've decided it's time for me to step up and take action.''
Sunday's 23-16 loss to the Carolina Panthers proved the final straw for Atlanta's hierarchy following a 0-5 start to the season.
Quinn oversaw a 43-42 record since the start of the 2015 season, including a painful loss to the New England Patriots in Super Bowl LI after squandering a 28-3 lead, while Dimitroff joined the Falcons in 2008.
The Falcons, who travel to the Minnesota Vikings in Week 6, are set to announce an interim coach on Monday.
"Decisions like these are very difficult, but the previous two seasons and start to this one have been especially hard for me because of the deep love, admiration and respect I and my family have for Dan, Thomas and their families," said Falcons owner and chairman Arthur Blank.
"For many years, they have represented me, our team, organisation and Atlanta with class, commitment and all the passion you would want in the leaders of the team. But as everyone knows, this is a results business and I owe it to our fans to put the best product we can on the field. We have poured every resource possible into winning and will continue to do so, but the results of late do not meet our standard or what I've promised our fans. Therefore, we will install new coaching and personnel leadership of the Atlanta Falcons at the appropriate time.
"Our finish in 2019 earned an opportunity to show that momentum could be continued and built upon, but that has clearly not happened," Blank continued. "And overall, the last 3-plus seasons have fallen short of my commitment to Atlanta and to our fans everywhere. I want them all to know that my commitment to winning has not wavered and I will continue to provide every resource possible to that end."
Falcons president and chief executive Rich McKay added: "We are moving forward and will do everything we can to help this year's team win as many games as possible while putting a strong plan in place to execute these important leadership searches with an eye to positioning the Falcons for success well into the future. We owe that to our fans."
The Falcons became the first team in NFL history to have back-to-back games in which they blew a 15-plus point fourth-quarter lead and lost, as per STATS, after Sunday's 30-26 defeat to the Chicago Bears.
Atlanta led 26-10 heading into the fourth quarter at Mercedes-Benz Stadium, but slipped to 0-3 to put the pressure on Quinn.
But Ryan, who completed 19 of 38 passes for 238 yards, a touchdown and an interception, said the players also needed to improve.
"We've got his back. We've got to play better as players and that's what you have to focus on," he said.
"When things aren't going good or going well, it's easy to look around and see what everybody else is doing or where everybody else is screwing up.
"The only way we're going to improve as a unit is if we all kind of look in the mirror and find ways to improve individually and make sure that we're the best version of ourselves individually when we go out there."
Ryan said he was frustrated after the Falcons also blew a 39-24 lead to the Dallas Cowboys in Week 2.
The QB lamented Atlanta's inability to get any momentum going in the fourth quarter against Chicago.
"We just needed to get into that first first down and we weren't able to do it. It's a credit to them," Ryan said.
"Chicago played well in that fourth quarter, they did a nice job, but we've got to find a way to get it done.
"We've got to find a way in one of those drives to get that first first down, get a little momentum going, put them on their heels a little bit and secure that ball game. We weren't able to do it."
