The Steelers have agreed to terms with veteran tight end Matt Spaeth to a 2-year contract.
Spaeth, 31, had been scheduled to become an unrestricted free agent at 4 p.m. on Tuesday.
Photos of the Steelers Tight Ends during the 2014 season.
"I think of Pittsburgh as home now," said Spaeth. "This organization is the best in the world, and I am just happy to be back."
Spaeth, 6-foot-7, 260 pounds, appeared in 15 regular-season games in 2014 (eight starts) and caught three passes for 46 yards and a touchdown, and also started the Steelers' playoff game against Baltimore.
The Steelers' offense had one of the finest seasons in team history in 2014, setting numerous single-season team records. Spaeth is excited about the upcoming 2015 season and where the offense could go.
"I think we will have all the pieces back, said Spaeth. "We had a very successful 2014. But now it's on each and every one of us to get ready and try to take it to the next level."
His career totals include 53 receptions for 410 yards and 10 touchdowns in eight NFL seasons (40-332-7 in six seasons with the Steelers).
Spaeth first joined the Steelers as a third-round pick (77th overall) out of Minnesota in 2007.
He left via free agency after the 2010 season and spent the next two seasons with Chicago before re-signing with the Steelers as a free agent in 2013 after being released by the Bears.
Spaeth missed the first 12 games in his first season back due to a foot injury and the Steelers went 5-7 without him in the lineup.
They closed at 3-1 once Spaeth returned on the way to an 8-8 finish.
Spaeth started Super Bowl XLIII against Arizona and Super Bowl XLV against Green Bay as a second tight end.
He's played in 110 career NFL regular-season games (66 starts) and eight career postseason games (seven starts).
Cornerbacks Brice McCain and Ike Taylor, defensive end Clifton Geathers, free safety Will Allen, outside linebackers James Harrison and Jason Worilds, running back Ben Tate, tight end Michael Palmer and wide receiver Darrius Heyward-Bey are scheduled to become unrestricted free agents on Tuesday.
Long-snapper Greg Warren re-signed a one-year contract with the Steelers on Feb. 4 and linebacker Arthur Moats agreed to terms with the Steelers on a three-year contract on March 9.