Before the Cardinals released Tyrann Mathieu earlier this week, Reid, 26, was considered the best available safety.
King was an inside linebacker and key special teams contribugtor for the Midshipmen from 2009-11, appearing in 38 games over three seasons.
The Ravens will now pursue another wide receiver after Grant failed his physical Thursday.
Adrian Clayborn set the Falcons' record for sacks in a game with six against the Cowboys Nov. 12.
Benson was hospitalized with the flu nearly a month ago, but the team announced he died Thursday at the Ochsner Medical Center.
The Vikings confirmed one of the worst-kept secrets during NFL free agency Thursday, signing Kirk Cousins to be their quarterback.
The 25-year-old caught 50 passes for 357 yards and three touchdowns for the Jets last season.
In nine years (eight with the Titans and one with the Browns), Jason has 464 tackles, 16 interceptions and eight forced fumbles.
Taylor threw for 2,799 yards and 14 touchdowns with four interceptions in 15 games for Buffalo last season.
Poe has been remarkably durable, starting 92 of 94 games in his six-season NFL career.