Hours after introducing the five free agents they landed Wednesday, the Bears added a sixth Thursday when they inked outside linebacker Aaron Lynch to a one-year contract.
Lynch, 25, spent his first four NFL seasons with the 49ers. Selected by San Francisco in the fifth round of the 2014 draft out of South Florida, he has appeared in 44 games with 19 starts, recording 83 tackles, 15 sacks, 45 tackles and 28 tackles-for-loss.
Bears defensive coordinator Vic Fangio served in the same capacity with the 49ers in 2014 when Lynch recorded six sacks while playing in all 16 games with three starts as a rookie.
Lynch is the first defensive free agent signed by the Bears from another team, though they did re-sign cornerback Prince Amukamara and outside linebacker Sam Acho Wednesday.
The five free agents the Bears added Wednesday were receivers Allen Robinson II (Jaguars) and Taylor Gabriel (Falcons), tight end Trey Burton (Eagles), backup quarterback Chase Daniel (Saints) and kicker Cody Parkey (Dolphins).