The Chargers began the offseason with 12 players scheduled to become unrestricted free agents.

Half are back with the team.

Seyi Ajirotutu, a special teams gunner and wide receiver, became the latest Monday, signing a one-year contract. He had a team-high 15 special teams tackles in 2013, forming a gunner tandem with captain Darrell Stuckey.

Ajirotutu, 26, spent little time on offense; his 178 special-teams snaps last season easily outnumbered his 44 routes ran.

But his season is best remembered for a Nov. 24 fly route down the left boundary in Kansas City. He hauled in a 26-yard reception with 24 seconds left, lifting the Chargers to a 41-38 upset win. The result saved San Diego's season, snapping a three-game losing streak. It was the Chiefs' first home loss of the year.

Ajirotutu called it "the biggest catch of my career." His season ended with three for 64 yards.

San Diego also has re-signed inside linebacker Donald Butler, guard Chad Rinehart, Stuckey, linebacker Reggie Walker, and cornerback Richard Marshall. Butler, Rinehart and Stuckey received extensions before they could hit the market March 11.

Versatile guard-center Rich Ohrnberger is the team's top in-house free agent still unsigned.