Willson appeared in eight games last season, starting seven, and caught eight passes for 79 yards. When discussing the team's depth at tight end during the NFL Scouting Combine, general manager John Schneider said, "We'd love to have Luke back as well."

Willson, a big part of Seattle's offense on two Super Bowl teams, has 110 career receptions for 1,295 and 11 touchdowns, and was on the receiving end of the most famous 2-point conversions in franchise history, a catch that played a big role in Seattle's NFC championship game victory over Green Bay. But Willson is beloved in Seattle not only for his on-field play, but for being one of the most unique characters in recent franchise history.

From launching the short shorts "movement" along with Jordan Roos to leading the way on Techno Thursday to espousing the occasional conspiracy theory—don't get him started on the moon landing—Willson is a true original, and one who will now continue his career in the city he has called home for almost his entire NFL career.

When the Seahawks brought Willson back last season, Seahawks coach Pete Carroll called him "just a lifeblood, energy guy in the program as well as a really good ballplayer."

Willson is the second tight end signing for the Seahawks this offseason, with former Panthers Pro-Bowler Greg Olsen joining the team in February following his release from Carolina. The Seahawks also will bring back restricted free agent Jacob Hollister, who signed his restricted free agent tender this afternoon.