Follow the Times-Union's live coverage from the 3 p.m. news conference.

It happened swiftly, just as Jaguars owner Shahid Khan said it would.

Mike Mularkey will be the fourth head coach in Jacksonville Jaguars history, sources told the Times-Union on Tuesday night.

Slideshow: See a synopsis of Mularkey's career

The decision came 40 days after the Jaguars fired Jack Del Rio, who was in his ninth year with the franchise, after a 3-8 start this season.

Mularkey interviewed in Atlanta on Tuesday, one of three offensive coordinators known to have interviewed for the position so far. Paramount for the Jaguars will be developing quarterback Blaine Gabbert, who the Jaguars drafted 10th overall in last year's draft, and Mularkey was part of the quick development of Falcons quarterback Matt Ryan.

Ryan was drafted out of Boston College in 2008, the same year Mularkey became the Falcons offensive coordinator. Ryan threw for 3,440 yards in his rookie year and had an 87.7 rating with 16 touchdowns and 11 interceptions.

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In the 2011 season, Ryan threw for 4,177 yards with 29 touchdowns and 12 interceptions. He had a passer rating of 92.2.

Mularkey, 50, was previously head coach with the Buffalo Bills, and went 9-7 in 2004 and 5-11 in 2005. Mularkey's Falcons were eliminated from the playoffs on Sunday in a 24-2 loss to the New York Giants.

Mularkey, a Miami native, is familiar with the area, having played for the University of Florida. He played tight end in the NFL for nine seasons (1983-91), six with the Minnesota Vikings and three with the Pittsburgh Steelers. His son, Patrick, is a scout for the Jaguars.

Mike Mularkey became the Falcons' offensive coordinator after a two-year stint as an assistant coach under Nick Saban with the Miami Dolphins. Mularkey was an offensive coordinator under Saban in 2006 and was scheduled to interview for the Dolphins' head coach opening this week.

Mularkey began his pro coaching career as a tight ends coach for Tampa Bay and Pittsburgh, then became the Steelers offensive coordinator from 2001-03 before going to Buffalo.

The Jaguars also interviewed Jaguars interim coach Mel Tucker, Jets offensive coordinator Brian Schottenheimer and Panthers offensive coordinator Rob Chudzinski.

The offseason won't slow with the hire, as Mularkey will now put together his staff. It remains to be seen if Tucker will remain as the defensive coordinator.

Tucker, with the help of revamped personnel, led the Jaguars defense to one of the biggest improvements in NFL history. The Jaguars ranked 28th last season and sixth in the NFL this season. They were as high as third until injuries sidelined several starters.

Tucker was in Minnesota on Tuesday night, interviewing with the Vikings for what is likely their defensive coordinator position. The Vikings have yet to fire their defensive coordinator, but also spoke with former Buccaneers head coach Raheem Morris last week.

tania.ganguli@jacksonville.com, (904) 359-4401