The Seahawks have signed safety Maurice Alexander, a source tells Ian Rapoport of NFL.com (on Twitter). The former Rams safety will help fill the void after Earl Thomas was placed on IR. 
Alexander, 27, started 14 games for the Rams in 2016 and started four contests for the club last year. The former fourth-round pick wasn’t playing all that well, however, as Pro Football Focus graded Alexander as a bottom-10 safety in 2016. But Alexander offers both youth and experience, and could become a valuable reserve for the Seahawks.
For now, the Seahawks are expected to move forward with Tedric Thompson as Thomas’ replacement in the starting lineup. He joins Tre Flowers, Bradley McDougald, and Shaquill Griffin in a secondary that is talented, but not Legion Of Boom-level great.
If he’s active on Sunday, Alexander’s first contest will come against the Rams. Currently at 2-2, the Seahawks will look to hand the Rams their first loss of 2018.